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Disconnect the power cable (1) and data cable (2) from the rear of the optical drive.

IMPORTANT:

When removing the cables, pull the tab or connector instead of the cable itself to avoid

damaging the cable.

Push the green release latch on the right rear side of the drive toward the center of the drive (1), and
then slide the drive forward and out of the bay (2).

Drives

Содержание EliteDesk 705 G4

Страница 1: ...Maintenance and Service Guide HP EliteDesk 705 G4 MT Workstation PC ...

Страница 2: ... errors or omissions contained herein First Edition October 2018 Document Part Number L41701 001 Product notice This guide describes features that are common to most models Some features may not be available on your product To access the latest user guide go to http www hp com support and follow the instructions to find your product Then select User Guides Software terms By installing copying down...

Страница 3: ... another hard surface such as an adjoining optional printer or a soft surface such as pillows or rugs or clothing to block airflow Also do not allow the AC adapter to contact the skin or a soft surface such as pillows or rugs or clothing during operation The device and the AC adapter comply with the user accessible surface temperature limits defined by the International Standard for Safety of Info...

Страница 4: ...iv Safety warning notice ...

Страница 5: ...lectrostatic damage to equipment 10 Personal grounding methods and equipment 10 Grounding the work area 10 Recommended materials and equipment 11 Operating guidelines 11 Routine care 12 General cleaning safety precautions 12 Cleaning the computer case 12 Cleaning the keyboard 13 Cleaning the monitor 13 Cleaning the mouse 13 Service considerations 14 Power supply fan 14 Tools and software requireme...

Страница 6: ... inch drive 38 Installing a 5 25 inch drive 40 Removing a 9 5 mm slim optical drive 42 Installing a 9 5 mm slim optical drive 44 Removing a 3 5 inch hard drive 45 Installing a 3 5 inch hard drive 46 Removing a 2 5 inch hard drive 50 Installing a 2 5 inch hard drive 52 Removing and installing an M 2 SSD storage card 53 Fan sink 55 Processor 56 WLAN module 57 Power supply 58 System board 60 System b...

Страница 7: ...lash drive problems 103 Solving front panel component problems 104 Solving Internet access problems 104 Solving software problems 105 7 Computer Setup BIOS TPM and HP Sure Start 106 Using Computer Setup 106 Starting Computer Setup 106 Navigating and selecting in Computer Setup 106 Restoring factory settings in Computer Setup 106 Updating the BIOS 107 Determining the BIOS version 107 Downloading a ...

Страница 8: ...EFI version 122 Downloading HP PC Hardware Diagnostics UEFI by product name or number select products only 122 Using Remote HP PC Hardware Diagnostics UEFI settings select products only 123 Downloading Remote HP PC Hardware Diagnostics UEFI 123 Downloading the latest Remote HP PC Hardware Diagnostics UEFI version 123 Downloading Remote HP PC Hardware Diagnostics UEFI by product name or number 123 ...

Страница 9: ...Questions and answers 138 Using HP Sure Start select models only 139 Appendix E Specifications 140 Index 141 ix ...

Страница 10: ...x ...

Страница 11: ...guration features Features may vary depending on the model For support assistance and to learn more about the hardware and software installed on your computer model run the HP Support Assistant utility Standard configuration features 1 ...

Страница 12: ...NOTE The audio out headphone audio in microphone combo jack supports headphones line output devices microphones line input devices or CTIA style headsets NOTE The USB port with HP Sleep and Charge provides current to charge a device such as a smart phone The charging current is available whenever the power cord is connected to the system even when the system is off NOTE The light on the power butt...

Страница 13: ... USB 2 0 ports with wake from S4 2 5 USB 2 0 ports 2 10 Power connector NOTE When a graphics card is installed in one of the system board slots the video connectors on the graphics card and or the integrated graphics on the system board may be used The specific graphics card installed and software configuration will determine the behavior The system board graphics can be disabled by changing setti...

Страница 14: ...ach computer has a unique serial number and a product ID number that are located on the exterior of the computer Keep these numbers available for use when contacting customer service for assistance 4 Chapter 1 Product features ...

Страница 15: ...r complete and current information on supported parts for your computer go to http partsurfer hp com select your country or region and then follow the on screen instructions Computer major components Item Description 1 Access panel 2 Power supply 400 W 250 W Computer major components 5 ...

Страница 16: ...l drive 7 Rear fan 8 Flex port module HDMI VGA USB Type C 3 1 Gen 2 or DisplayPort 9 Fan sink includes replacement thermal material 10 Solid state drive NVMe M 2 2280 PCIe 1 TB TLC 512 GB TLC 512 GB 512 GB self encrypting drive SED TLC 256 GB TLC 256 GB 256 GB self encrypting drive SED TLC 128 GB TLC 128 GB 11 Front bezel 12 Second serial port optional 13 Processor includes replacement thermal mat...

Страница 17: ...PS 2 serial port option card select models only not illustrated Printer port option card not illustrated 17 Hard drive 3 5 inch 2 TB 7200 rpm 2 TB 5400 rpm 7 mm 2 TB 5400 rpm hybrid SSD 7 mm 1 TB 7200 rpm 1 TB 7200 rpm 9 5 mm 1 TB 5400 rpm hybrid SSD 9 5 mm 500 GB 7200 rpm 7 mm 500 GB 7200 rpm 500 GB 7200 rpm OPAL2 self encrypting drive SED 7 mm 500 GB 5400 rpm FIPS 7 mm 500 GB 5400 rpm hybrid SSD...

Страница 18: ...antenna 2nd serial port includes cable Slim optical drive latch 5 25 inch to 3 5 inch hard drive adapter HP USB Type C to USB Type A Hub SATA drive power cable DisplayPort cable DVI monitor cable Adapters DisplayPort to VGA DisplayPort to DVI DisplayPort to HDMI 2 0 USB Type C to USB 3 0 USB to serial port USB Type C to DisplayPort Mouse PS2 optical USB laser USB optical USB premium USB washable P...

Страница 19: ...ycle The device may function normally for a while but it has been degraded in the internal layers reducing its life expectancy Networks built into many integrated circuits provide some protection but in many cases the discharge contains enough power to alter device parameters or melt silicon junctions Generating static The following table shows the following about static electricity Different acti...

Страница 20: ...nugly into the banana plug connector on the grounding mat or workstation Heel straps Toe straps Boot straps can be used at standing workstations and are compatible with most types of shoes or boots On conductive floors or dissipative floor mats use them on both feet with a maximum of one megohm 10 resistance between the operator and ground Static Shielding Protection Levels Method Voltage Antistat...

Страница 21: ...heat and cold Operate the computer on a sturdy level surface Leave a 10 2 cm 4 inch clearance on all vented sides of the computer and above the monitor to permit the required airflow Never restrict the airflow into the computer by blocking any vents or air intakes Do not place the keyboard with the keyboard feet down directly against the front of the desktop unit as this also restricts airflow Occ...

Страница 22: ... static free cloth without oil Static free cloth wipes For stronger stains use a mild dishwashing liquid diluted with water Rinse well by wiping the surface with a cloth or swab dampened with clear water CAUTION Avoid strong cleaning solvents or germicidal wipes that can permanently damage your computer If you are not sure that a cleaning product is safe for your computer check the product content...

Страница 23: ...y removed or installed the keyboard may not function properly Cleaning the monitor Wipe the monitor screen with a clean cloth moistened with water or with a towelette designed for cleaning monitors CAUTION Do not use sprays or aerosols directly on the screen the liquid may seep into the housing and damage a component Never use solvents or flammable liquids on the monitor To clean the monitor body ...

Страница 24: ...he reassembly process it can damage the unit HP strongly recommends that all screws removed during disassembly be kept with the part that was removed then returned to their proper locations CAUTION Metric screws have a black finish U S screws have a silver finish and are used on hard drives only CAUTION As each subassembly is removed from the computer it should be placed away from the work area to...

Страница 25: ...cell battery The battery that comes with the computer provides power to the real time clock and has a minimum lifetime of about three years For instructions on replacement procedures see the appropriate removal and replacement chapter in this guide for the chassis you are working on WARNING This computer contains a lithium battery There is a risk of fire and chemical burn if the battery is handled...

Страница 26: ...ert Cable management Always follow good cable management practices when working inside the computer Keep cables away from major heat sources like the heat sink Do not jam cables on top of expansion cards or memory modules Printed circuit cards like these are not designed to take excessive pressure on them Keep cables clear of sliding or moveable parts to prevent them from being cut or crimped when...

Страница 27: ...and turn off any external devices 4 Disconnect the power cord from the AC outlet and disconnect any external devices IMPORTANT You must disconnect the power cord and wait approximately 30 seconds for the power to drain before adding or removing memory modules Regardless of the power on state voltage is always supplied to the memory modules as long as the computer is plugged into an active AC outle...

Страница 28: ...sassembly Preparation for disassembly on page 17 2 Slide the access panel release lever to the left 1 so that it locks into place Then slide the access panel back 2 and lift it off the computer 3 To replace the access panel reverse the disassembly procedures 18 Chapter 4 Removal and replacement procedures ...

Страница 29: ...aration for disassembly on page 17 2 Remove the access panel Access panel on page 18 3 Lift up the three tabs on the top of the bezel 1 and then rotate the bezel off the chassis 2 To replace the front bezel reverse the disassembly procedures Front bezel 19 ...

Страница 30: ... of the chassis into the front bezel 1 Prepare the computer for disassembly Preparation for disassembly on page 17 2 Remove the access panel Access panel on page 18 3 Remove the 6 32 security screw from the inside of the front bezel 4 Replace the front bezel 20 Chapter 4 Removal and replacement procedures ...

Страница 31: ...5 Install the 6 32 security screw through the front of the chassis and into the screw hole located below the center bezel release tab 6 Replace the front bezel and access panel Front bezel security 21 ...

Страница 32: ...k 1 Prepare the computer for disassembly Preparation for disassembly on page 17 2 Remove the access panel Access panel on page 18 3 Remove the front bezel Front bezel on page 19 4 To remove a 5 25 inch optical drive bezel blank press inward on the two tabs on the right side of the blank 1 and then rotate the blank off the front bezel 2 22 Chapter 4 Removal and replacement procedures ...

Страница 33: ... drive bezel blank press inward on the tab on the right side of the blank 1 and then rotate the blank away from the front bezel 2 and slide the left side of the blank out of the slot on the front bezel 3 Removing bezel blanks 23 ...

Страница 34: ...s available from HP To remove clean and replace the dust filter 1 Prepare the computer for disassembly Preparation for disassembly on page 17 2 To remove the dust filter use your fingers to separate the filter from the front bezel at the tab locations shown below 3 Use a soft brush or cloth to clean dust from the filter If heavily soiled rinse the filter clean with water To replace the filter reve...

Страница 35: ...TA0 dark blue Primary hard drive 6 SATA 3 0 SATA1 light blue Any SATA device other than the primary hard drive 7 DIMM4 Channel A DIMM4 white Memory module 8 DIMM3 Channel B DIMM3 black Memory module 9 DIMM2 Channel A DIMM2 white Memory module 10 DIMM1 Channel B DIMM1 black Memory module 11 SATA 3 0 SATA2 light blue Any SATA device other than the primary hard drive 12 SATA 3 0 SATA3 light blue Any ...

Страница 36: ...atch and rotating the latch to the open position 4 Locate the correct vacant expansion socket on the system board and the corresponding expansion slot on the back of the computer chassis 5 Before installing an expansion card remove the expansion slot cover or the existing expansion card NOTE Before removing an installed expansion card disconnect any cables that may be attached to the expansion car...

Страница 37: ...rd at each end and carefully rock it back and forth until the connectors pull free from the socket Lift the card straight up 1 then away from the inside of the chassis 2 to remove it Be sure not to scrape the card against other components Expansion cards 27 ...

Страница 38: ...the inside of the chassis 3 to remove it Be sure not to scrape the card against other components 6 Store the removed card in anti static packaging 7 If you are not installing a new expansion card install an expansion slot cover to close the open slot IMPORTANT After removing an expansion card you must replace it with a new card or expansion slot cover for proper cooling of internal components duri...

Страница 39: ...ht down into the expansion socket on the system board 2 NOTE When installing an expansion card press firmly on the card so that the whole connector seats properly in the expansion card socket 9 Rotate the slot cover retention latch back in place to secure the expansion card 10 Connect external cables to the installed card if needed Connect internal cables to the system board if needed 11 Reassembl...

Страница 40: ...l on page 18 3 Disconnect the fan control cable 1 from the system board connector labeled CHFAN2 4 Remove the three silver Phillips screws 2 that secure the fan to the rear of chassis 5 Lift the fan out of the chassis 3 NOTE System board appearance may vary To install the fan reverse the removal procedure Be sure to orient the air flow out of the chassis 30 Chapter 4 Removal and replacement proced...

Страница 41: ...port module 1 Prepare the computer for disassembly Preparation for disassembly on page 17 2 Remove the access panel Access panel on page 18 3 Remove the rear fan Rear fan on page 30 4 Remove the two Phillips screws 1 that secure the module to the system board 5 Lift to disengage the module from the system board connector and then remove the module from the computer 2 To install a flex port module ...

Страница 42: ...for disassembly on page 17 2 Remove the access panel Access panel on page 18 3 Remove the front bezel Front bezel on page 19 4 Disconnect the power and data cables from the rear of the drives in the drive cage 5 Lift the rear of the drive cage up 1 and then slide the drive cage back 2 Then lift the drive cage 3 out of the chassis 32 Chapter 4 Removal and replacement procedures ...

Страница 43: ...e cage with the slots on the chassis and press the drive cage down 1 into the chassis Then slide the drive cage forward 2 so that it locks in place 7 Reconnect the power and data cables to the rear of the drives in the drive cage Drive cage 33 ...

Страница 44: ...utomatically operate in single channel mode dual channel mode or flex mode depending on how the DIMMs are installed NOTE Single channel and unbalanced dual channel memory configurations will result in inferior graphics performance The system will operate in single channel mode if the DIMM sockets are populated in one channel only The system will operate in a higher performing dual channel mode if ...

Страница 45: ...h other Static electricity can damage the electronic components of the computer or optional cards Before beginning these procedures ensure that you are discharged of static electricity by briefly touching a grounded metal object For more information refer to Electrostatic discharge information on page 9 When handling a memory module be careful not to touch any of the contacts Doing so may damage t...

Страница 46: ...he closed position 3 7 Reassemble the computer 8 Reconnect the power cord and turn on the computer 9 Lock any security devices that were disengaged when the access panel was removed The computer should automatically recognize the additional memory the next time you turn on the computer 36 Chapter 4 Removal and replacement procedures ...

Страница 47: ...c discharge information on page 9 Handle a drive carefully do not drop it Do not use excessive force when inserting a drive Avoid exposing a hard drive to liquids temperature extremes or products that have magnetic fields such as monitors or speakers If a drive must be mailed place the drive in a bubble pack mailer or other protective packaging and label the package Fragile Handle With Care Drive ...

Страница 48: ...e will line up correctly in the drive cage and lock in place Mounting screws can be purchased from HP Removing a 5 25 inch drive CAUTION All removable media should be taken out of a drive before removing the drive from the computer 1 Prepare the computer for disassembly Preparation for disassembly on page 17 2 Remove the access panel Access panel on page 18 3 Remove the front bezel Front bezel on ...

Страница 49: ...5 Push the green drivelock mechanism towards the drive 1 and then slide the drive from the drive bay 2 Drives 39 ...

Страница 50: ...lanks on page 22 for more information 4 If you are installing an optical drive install four M3 metric mounting screws not provided in the lower holes on each side of the drive NOTE M3 metric mounting screws can be purchased from HP If you are replacing a drive transfer the mounting screws from the old drive to the new drive IMPORTANT Use only 5 mm long screws as mounting screws Longer screws can d...

Страница 51: ... the front of the bay Insert a flat bladed screwdriver into the slots on the front of the shield 1 and rock the shield back and forth 2 to break it free from the chassis 6 Slide the drive into the drive bay making sure to align the mounting screws with the mounting slots until the drive snaps into place Drives 41 ...

Страница 52: ...ections on page 25 for an illustration of the system board drive connectors 9 Reassemble the computer Removing a 9 5 mm slim optical drive CAUTION All removable media should be taken out of a drive before removing the drive from the computer 1 Prepare the computer for disassembly Preparation for disassembly on page 17 2 Remove the access panel Access panel on page 18 42 Chapter 4 Removal and repla...

Страница 53: ...e IMPORTANT When removing the cables pull the tab or connector instead of the cable itself to avoid damaging the cable 4 Push the green release latch on the right rear side of the drive toward the center of the drive 1 and then slide the drive forward and out of the bay 2 Drives 43 ...

Страница 54: ...l blank remove the front bezel and then remove the bezel blank See Removing bezel blanks on page 22 for more information 4 Align the small pin on the release latch with the small hole on the side of the drive and press the latch firmly onto the drive 5 Slide the optical drive through the front of the chassis 1 all the way into the bay so that the green latch locks onto the chassis frame 2 44 Chapt...

Страница 55: ...ng a 3 5 inch hard drive NOTE Before you remove the old hard drive be sure to back up the data from the old hard drive so that you can transfer the data to the new hard drive 1 Prepare the computer for disassembly Preparation for disassembly on page 17 2 Remove the access panel Access panel on page 18 3 Disconnect the power cable 1 and data cable 2 from the rear of the hard drive Drives 45 ...

Страница 56: ...xt to the rear of the bracket outward 1 While pulling the release lever out lift the rear of the bracket up 2 and then slide the front of the bracket back and lift it out of the bay 3 Installing a 3 5 inch hard drive 1 Prepare the computer for disassembly Preparation for disassembly on page 17 2 Remove the access panel Access panel on page 18 3 Install mounting screws on the sides of the hard driv...

Страница 57: ...rom the old drive to the new drive Install four silver and blue 6 32 mounting screws two on each side of the drive You can also install a 2 5 inch hard drive into a 3 5 inch drive bay using an adapter bracket similar to the example shown below Slide the 2 5 inch drive into the 3 5 inch adapter bracket Drives 47 ...

Страница 58: ...talling four black M3 adapter bracket screws through the underside of the bracket and into the drive Install four 6 32 silver and blue mounting screws in the adapter bracket two on each side of the bracket 48 Chapter 4 Removal and replacement procedures ...

Страница 59: ...nto the bay 1 Then press the rear of the bracket down into the drive bay 2 to lock it in place 4 Align the mounting screws on the front of the hard drive with the slots on the drive cage and press the front of the drive down and forward into the bay 1 Then press the rear of the drive down into the drive bay 2 to lock it in place Drives 49 ...

Страница 60: ...her end of the data cable to the dark blue SATA connector on the system board labeled SATA0 If it is a secondary hard drive connect the other end of the data cable to one of the light blue SATA connectors on the system board 7 Reassemble the computer Removing a 2 5 inch hard drive 1 Prepare the computer for disassembly Preparation for disassembly on page 17 2 Remove the access panel Access panel o...

Страница 61: ...le 2 from the rear of the hard drive 4 Pull the release lever at the rear of the drive outward 1 and lift the rear of the drive up 2 Then slide the front of the drive back until it stops and pull the drive up and out of the drive bay 3 Drives 51 ...

Страница 62: ... mounting screws can be purchased from HP When replacing a drive transfer the four mounting screws from the old drive to the new drive 4 Align the front mounting screws on the drive with the J slots on the sides of the drive bay Press the front of the drive into the drive bay and then slide the drive forward 1 Then press the rear of the drive down into the drive bay 2 so that the drive is secured ...

Страница 63: ... of the data cable to one of the light blue SATA connectors on the system board 6 Reassemble the computer Removing and installing an M 2 SSD storage card NOTE There is one M 2 SSD socket on the system board The computer supports 2230 and 2280 M 2 SSD cards 1 Prepare the computer for disassembly Preparation for disassembly on page 17 2 Remove the access panel Access panel on page 18 3 Remove the fr...

Страница 64: ... card slide the pins on the card into the system board connector while holding the card at approximately a 30 angle 1 Press the other end of the card down 2 and then secure the card with the screw 3 7 Reassemble the computer 8 Connect the power and data cables to the rear of the drives in the hard drive cage 9 Reassemble the computer 54 Chapter 4 Removal and replacement procedures ...

Страница 65: ...board connector labeled CPUFAN 1 4 Loosen the four silver captive Torx T15 screws 2 that secure the fan sink to the system board CAUTION Remove fan sink retaining screws in diagonally opposite pairs as in an X to even the downward forces on the processor The pins on the socket are very fragile and any damage to them may require replacing the system board 5 Lift the heat sink from atop the processo...

Страница 66: ...maged it may be necessary to replace the system board The heat sink must be installed within 24 hours of installing the processor to prevent damage to the processor s solder connections Reverse the removal procedure to install a new processor TIP When installing the processor be sure to align the gold triangle printed on the corner of the processor with the gold triangle printed on the system boar...

Страница 67: ...2 6 Disconnect the WLAN antenna cables 1 from the terminals on the WLAN module NOTE The WLAN antenna cable labeled 1 connects to the WLAN module Main terminal labeled 1 The WLAN antenna cable labeled 2 connects to the WLAN module Aux terminal labeled 2 Some modules have only one connected antenna cable 7 Remove the Phillips PM2 0 3 0 screw 2 that secures the WLAN module to the computer The edge of...

Страница 68: ...computer for disassembly Preparation for disassembly on page 17 2 Remove the access panel Access panel on page 18 3 Remove the front bezel Front bezel on page 19 4 Disconnect the power and data cables from the rear of the drives in the drive cage 5 Remove the drive cage Drive cage on page 32 6 Disconnect the power supply cables from the following system board connectors PWRCPU PWR PWRCMD 58 Chapte...

Страница 69: ...o the rear of the chassis 8 Press the release lever at the front of the power supply 1 slide the power supply toward the front of the computer and then lift the power supply out of the chassis 2 To install the power supply reverse the removal procedure Power supply 59 ...

Страница 70: ... page 32 6 When replacing the system board make sure the following components are removed from the defective system board and installed on the replacement system board Memory modules Memory on page 34 Expansion cards Expansion cards on page 26 M 2 solid state drive Removing and installing an M 2 SSD storage card on page 53 Fan sink Fan sink on page 55 Processor Processor on page 56 WLAN module WLA...

Страница 71: ... power supply connector PWRCMD 2 Black drive power connector SATAPWR1 3 Drive connector SATA3 4 Drive connector SATA2 5 Hard drive connector SATA0 6 Rear fan connector CHFAN2 7 White power supply connector PWR 8 Optical drive connector SATA1 9 Black drive power connector SATAPWR0 10 White power supply connector PWRCPU System board 61 ...

Страница 72: ...rd and then pull board toward the rear and up and out of the computer 2 When reinstalling the system board insert the front of the system board into the front chassis slot lower the board down into the base pan and then slide the system board back into the rear I O ports Do not attempt to install the board straight down into the chassis as this may damage the rear EMI gaskets 62 Chapter 4 Removal ...

Страница 73: ...ion card SATA2 Light blue Any SATA Device other than the primary hard drive X1PCIEXP1 Black Expansion card CMOS Yellow Reset CMOS X16PCIEXP Black Expansion card BAT Black RTC battery COMA Black Optional serial port WIRELESS Black WLAN module CHFAN2 Brown Rear fan connector SSD1 Black M 2 solid state drive COMM_DP Black Flex port module USBCDEG White USB Type C PROCESSOR Silver Processor SATAPWR1 B...

Страница 74: ...TA Device other than the primary hard drive DIMM3 Black Memory module SATA0 Dark blue Primary hard drive DIMM2 White Memory module HLCK Black Hood lock DIMM1 Black Memory module PSWD Green Clear system passwords SATAPWR0 Black Drive power HSENSE White Hood sensor PWR White Power supply PS2 COM Black PS 2 module 64 Chapter 4 Removal and replacement procedures ...

Страница 75: ...Secure Boot power management virtualization support and language and keyboard type used in Setup and POST Replicate the system setup by saving system configuration information on a USB device and restoring it on one or more computers Enable or disable DriveLock security or securely erase a hard drive when supported by drive Using Computer Setup F10 Utilities Computer Setup can be accessed only by ...

Страница 76: ...anced and Main menus to those previously saved by Save Custom Defaults select Apply Custom Defaults and Exit If no custom defaults have been saved then factory defaults are used NOTE Settings in the Security menu are not modified by Apply Defaults Those values are reset by Restore Security Settings to Factory Defaults at the bottom of the Security menu NOTE Not all settings shown in the following ...

Страница 77: ...e Firmware System BIOS version ME Firmware version Intel only Video BIOS version Reference code version Super I O Firmware version USB Type C controller s firmware version Service Born on date Serial number SKU number UUID Universally Unique Identifier Asset tracking number Feature byte Build ID Product family System board ID System board CT number Communication Integrated MAC Address System Diagn...

Страница 78: ...lect to enter the minimum BIOS version that can be rolled back to Unrestricted rollback to older BIOS Restricted rollback to older BIOS Allow BIOS updates using a network BIOS Update Preferences Allows the administrator to select the source of network updates www hp com or another network server and allows configuration of a periodic check for updates including policies for Check for updates and p...

Страница 79: ...em settings BIOS Configuration Utility BCU Alternative power on password NOTE Creating a BIOS user disables the Fast Boot option NOTE If the password is set it is required to change Computer Setup options update the BIOS and make changes to certain plug and play settings under Windows Change BIOS Administrator Password This selection is active only if a BIOS administrator password is set Lets you ...

Страница 80: ...rusion Prevention and Detection Enables monitoring of firmware executing out of main memory while the operating system is running Any anomalies detected in firmware that are active while the operating system is running results in generation of a Sure Start Security Event Default is enabled Sure Start Security Event Policy Controls HP Sure Start behavior upon identifying a critical security event a...

Страница 81: ...ccess to the MBR of the current bootable disk the BIOS cannot prevent changes that may occur while the operating system is running Restores the backup Master Boot Record to the current bootable disk Default is disabled Only appears if all of the following conditions are true MBR security is enabled A backup copy of the MBR has been previously saved The current bootable disk is the same disk from w...

Страница 82: ...keyboard layout Scheduled Power On This feature wakes the system up from a powered off state at a specified date and time Boot Options Select the devices that the computer can boot from as well as other options including Startup Menu Delay sec Enabling this feature will add a user specified delay to the POST process One purpose for the delay is to provide additional time to activate hotkeys such a...

Страница 83: ...ey Management Lets you manage the custom key settings Import Custom Secure Boot keys Default is disabled Clear Secure Boot Keys Lets you delete any previously loaded custom boot keys Clearing keys will disable secure boot Default is disabled Reset Secure Boot keys to factory defaults Default is disabled Enable MS UEFI CA key Disabling this setting alters the Secure Boot key list to further restric...

Страница 84: ...ture or configure where the computer boots including the network or hard drive Default is Boot to Network Dust Filter Select to enable the Dust Filter replacement reminder which can be set for 15 30 60 90 120 or 180 days The reminder will show during POST after the reminder timer has expired Video Memory Size Use this option to manage graphics memory allocation The value you choose is allocated pe...

Страница 85: ...d to different ports The ports disabled by the BIOS will remain disabled until the system is restarted Option ROM Launch Policy These policies control whether Legacy Option ROMs or UEFI drivers are loaded Default is All UEFI for Windows 10 or later Configure Option ROM Launch Policy All legacy All UEFI All UEFI except video Power Management Options Runtime Power Management enable disable Allows ce...

Страница 86: ...fault is disabled USB Redirection Support enable disable Default is enabled USB redirection allows USB devices plugged into a client computer to be transparently redirected to the guest operating system Unconfigure AMT on next boot Do Not Apply Apply Default is Do Not Apply SOL Terminal Emulation Mode ANSI VT100 Default is ANSI SOL terminal emulation mode is only activated during remote AMT redire...

Страница 87: ...to Removable Media option creates a file named HPSETUP TXT on an inserted USB flash media device This file can be edited to change the settings on Restore An asterisk marks the selected option for a setting NOTE It is recommended that you save any modified computer configuration settings to a USB flash media device and save the device for possible future use To restore the configuration insert the...

Страница 88: ...ee if it is flashing red The flashing lights are error codes that will help you diagnose the problem Refer to POST error messages and diagnostic front panel LEDs and audible codes on page 110 for more information If the screen is blank plug the monitor into a different video port on the computer if one is available Or replace the monitor with a monitor that you know is functioning properly If you ...

Страница 89: ...urned on and the green monitor light is on Check the Power LED on the front of the computer to see if it is flashing red The flashing lights are error codes that will help you diagnose the problem Refer to POST error messages and diagnostic front panel LEDs and audible codes on page 110 for more information Turn up the brightness and contrast controls of the monitor if the monitor is dim Press and...

Страница 90: ...applied to the system board To reduce the risk of personal injury from electrical shock and or hot surfaces be sure to disconnect the power cord from the wall outlet and allow the internal system components to cool before touching Cannot access the Computer Setup F10 Utility when booting the computer Cause Solution The Computer Setup F10 Utility is set to fast boot causing the F10 access screen to...

Страница 91: ...ected and powered on and that the speakers volume control is set correctly 3 Use the system volume control available in the operating system to make sure the speakers are not muted or to increase the volume Cannot remove computer cover or access panel Cause Solution Smart Cover Lock featured on some computers is locked Unlock the Smart Cover Lock using Computer Setup In case of forgotten password ...

Страница 92: ... application or consult the documentation that came with the application for suggestions on how to improve performance by adjusting parameters in the application 2 Add more memory 3 Upgrade the graphics solution Cause unknown Restart the computer Computer powered off automatically and the Power LED flashes red four times and then white two times Cause Solution Processor thermal protection activate...

Страница 93: ... OR Press and hold the power button for less than 4 seconds If the hard drive LED does not turn on white then 1 Check that the unit is plugged into a working AC outlet 2 Open the access panel and check that the power button cable is properly connected to the system board 3 Check that the power supply cables are properly connected to the system board 4 Check to see if the 5V_aux light on the system...

Страница 94: ...stem fan spins If the fan does not spin make sure the fan cable is plugged onto the system board header 3 If fan a plugged in and not spinning replace it Power LED flashes Red four times once every second followed by a two second pause and the computer beeps four times Beeps stop after fifth iteration but LEDs continue flashing Computer powered off automatically and the Power LED flashes red three...

Страница 95: ...irections in the Solving hardware installation problems on page 96 section If the system still does not recognize the new device check to see if the device is listed within Computer Setup If it is listed the probable cause is a driver problem If it is not listed the probable cause is a hardware problem If this is a newly installed drive run the Computer Setup utility and try adding a POST delay un...

Страница 96: ...ptions Boot order is not correct Run the Computer Setup utility and change boot sequence in Advanced Boot Options Hard drive is damaged Observe if the front panel Power LED is blinking RED and if any beeps are heard See POST error messages and diagnostic front panel LEDs and audible codes on page 110 to determine possible causes for the blinking red and beep codes See the Worldwide Limited Warrant...

Страница 97: ...ng the media card is a safety feature that prevents writing to and deleting from an SD Memory Stick PRO card If using an SD card make sure that the lock tab located on the right of the SD card is not in the locked position If using a Memory Stick PRO card make sure that the lock tab located on the bottom of the Memory Stick PRO card is not in the locked position Unable to access data on the media ...

Страница 98: ...d on and the monitor light is not on Turn on the monitor and check that the monitor light is on Bad monitor Try a different monitor The cable connections are not correct Check the cable connection from the monitor to the computer and to the electrical outlet You may have a screen blanking utility installed or energy saver features are enabled Press any key or click the mouse button and type your p...

Страница 99: ... third party memory with HP memory 4 Replace the system board Blank screen and the power LED flashes Red six times once every second followed by a two second pause and the computer beeps six times Beeps stop after fifth iteration but LEDs continue flashing Cause Solution Pre video graphics error For systems with a graphics card 1 Reseat the graphics card if applicable Power on the system 2 Replace...

Страница 100: ...ncorrectly adjusted 1 Be sure the monitor cable is securely connected to the computer 2 In a two monitor system or if another monitor is in close proximity be sure the monitors are not interfering with each other s electromagnetic field by moving them apart 3 Fluorescent lights or fans may be too close to the monitor Monitor needs to be degaussed Degauss the monitor Refer to the documentation that...

Страница 101: ...ernal digital conversion circuits may be unable to correctly interpret the output synchronization of the graphics card 1 Select the monitor s Auto Adjustment option in the monitor s on screen display menu 2 Manually synchronize the Clock and Clock Phase on screen display functions To download a SoftPaq that will assist you with the synchronization go to the following Web site select the appropriat...

Страница 102: ...peakers plugged into the wrong audio jack on a recently installed sound card See the sound card documentation for proper speaker connection The rear audio jack output is the green receptacle Headphones or devices connected to the line out connector mute the internal speaker Turn on and use headphones or external speakers if connected or disconnect headphones or external speakers Computer is in Sle...

Страница 103: ...t audio over the DisplayPort connection if applicable so multiple audio devices may be listed in Device Manager Make sure the correct device is being used To access Device Manager in Windows 10 type device manager in the taskbar search box and then select Device Manager from the list of applications Some applications can select which audio output device is used Make sure the application has select...

Страница 104: ...memory may be overloaded Reset the printer by turning it off for one minute then turn it back on Printer will not print Cause Solution The printer may be out of paper Check the paper tray and refill it if it is empty Solving keyboard and mouse problems If you encounter keyboard or mouse problems see the documentation that came with the equipment and to the common causes and solutions listed in the...

Страница 105: ...ow keys to scroll to and select the power icon at the top right on the menu and then press Enter 3 Use the arrow keys to select Shut Down and then press Enter 4 After the shutdown is complete plug the mouse connector into the back of the computer or the keyboard and restart Program in use has stopped responding to commands Shut down the computer using the keyboard then restart the computer Mouse m...

Страница 106: ...rned on Turn off the computer turn on the external device then turn on the computer to integrate the device with the computer system When the system advised you of changes to the configuration you did not accept them Reboot the computer and follow the instructions for accepting the changes A plug and play board may not automatically configure when added if the default configuration conflicts with ...

Страница 107: ... the process of debugging the network cabling Network driver does not detect network controller Cause Solution Network controller is disabled 1 Run Computer Setup and enable network controller 2 Enable the network controller in the operating system using Device Manager To access Device Manager in Windows 10 type device manager in the taskbar search box and then select Device Manager from the list ...

Страница 108: ... and that the other end of the cable is securely attached to the correct device The cable is attached to the incorrect connector Ensure that the cable is attached to the correct connector There is a problem with the cable or a device at the other end of the cable Ensure that the cable and device at the other end are operating correctly The network controller is defective Contact an authorized serv...

Страница 109: ...her source Cannot connect to network server when attempting Remote System Installation Cause Solution The network controller is not configured properly Verify Network Connectivity that a DHCP Server is present and that the Remote System Installation Server contains the NIC drivers for your NIC System setup utility reports unprogrammed EEPROM Cause Solution Unprogrammed EEPROM Contact an authorized...

Страница 110: ...You have run out of memory to run the application Check the application documentation to determine the memory requirements Memory count during POST is wrong Cause Solution The memory modules may not be installed correctly Check that the memory modules have been installed correctly and that proper modules are used Integrated graphics may use system memory No action required Insufficient memory erro...

Страница 111: ...t have automatically recognized a newly installed device See reconfiguration directions in the Solving hardware installation problems on page 96 section If the system still does not recognize the new device check to see if the device is listed within Computer Setup If it is listed the probable cause is a driver problem If it is not listed the probable cause is a hardware problem If this is a newly...

Страница 112: ...e takes longer to start because it has to determine the type of media played such as audio or video Wait at least 30 seconds to let the DVD ROM drive determine the type of media being played If the disc still does not start read the other solutions listed for this topic CD or DVD disc is dirty Clean CD or DVD with a CD cleaning kit available from most computer stores Windows does not detect the CD...

Страница 113: ...ce was not properly seated before power up Ensure the device is fully inserted into the USB port before applying power to the system System will not boot from USB flash drive Cause Solution Boot order is not correct Run the Computer Setup utility and change boot sequence in Advanced Boot Options Removable Media Boot is disabled in the Computer Setup utility Run the Computer Setup utility and enabl...

Страница 114: ...listed in the following table Unable to connect to the Internet Cause Solution Internet Service Provider ISP account is not set up properly Verify Internet settings or contact your ISP for assistance Web browser is not set up properly Verify that the Web browser is installed and set up to work with your ISP Cable DSL modem is not plugged in Plug in cable DSL modem You should see a power LED light ...

Страница 115: ...r than the factory installed operating system check to be sure it is supported on the system If you encounter software problems see the applicable solutions listed in the following table Computer will not continue and the HP logo does not display Cause Solution ROM issue POST error has occurred Observe the beeps and LED lights on the front of the computer See POST error messages and diagnostic fro...

Страница 116: ...wn arrow key on the keyboard To close open dialog boxes and return to the main Computer Setup screen press esc and then follow the on screen instructions To exit Computer Setup choose one of the following methods To exit Computer Setup menus without saving your changes select Main select Ignore Changes and Exit and then select Yes NOTE If you are using arrow keys to highlight your choice you must ...

Страница 117: ...out saving your changes select Main select Ignore Changes and Exit and then select Yes NOTE If you are using arrow keys to highlight your choice you must then press enter To check for later BIOS versions see Downloading a BIOS update on page 107 Downloading a BIOS update CAUTION To reduce the risk of damage to the computer or an unsuccessful installation download and install a BIOS update only whe...

Страница 118: ...en instructions NOTE After a message on the screen reports a successful installation you can delete the downloaded file from your hard drive Changing the boot order using the f9 prompt To dynamically choose a boot device for the current startup sequence follow these steps 1 Access the Boot Device Options menu Turn on or restart the computer and when the HP logo appears press f9 to enter the Boot D...

Страница 119: ... restores the BIOS to its previously safe state without user intervention HP Sure Start is configured and already enabled so that most users can use the HP Sure Start default configuration The default configuration can be customized by advanced users To access the latest documentation on HP Sure Start go to http www hp com support Select Find your product and then follow the on screen instructions...

Страница 120: ...hedule reconfigure the computer to the Full Boot Every x Days mode using Computer Setup NOTE For more information on Computer Setup see Computer Setup F10 Utility on page 65 POST numeric codes and text messages This section covers those POST errors that have numeric codes associated with them The section also includes some text messages that may be encountered during POST NOTE The computer will be...

Страница 121: ...g POST execution of the Management Engine ME BIOS Extensions option ROM 1 Reboot the computer 2 Unplug the power cord re seat the memory modules and reboot the computer 3 If the memory configuration was recently changed unplug the power cord restore the original memory configuration and reboot the computer 4 If the error persists replace the system board 00C PMM Deallocation Error during MEBx Clea...

Страница 122: ...cal SPD information or is incompatible with the chipset 1 Verify proper memory module type 2 Try another memory socket 3 Replace with a supported module 2E4 DIMM Configuration Warning The current memory configuration is not optimized Rearrange the DIMMs so that each channel has the same amount of memory 2E5 ECC Memory Module Detected on Unsupported Platform Recently added memory module s support E...

Страница 123: ...ot found Insert boot device or load operating system 3F1 Hard Disk 1 Error Hard disk 1 error 1 Check and or replace cables 2 Clear CMOS See Password security and resetting CMOS on page 117 3 Replace the hard disk drive 3F2 Hard Disk 2 Error Hard disk 2 error 1 Check and or replace cables 2 Clear CMOS See Password security and resetting CMOS on page 117 3 Replace the hard disk drive 400 Serial Port...

Страница 124: ...n the system board 43B More Than One USB type C Cards Are Installed More than one USB type C card is installed Remove USB type C card so only one is installed 500 BIOS Recovery A system BIOS recovery has occurred Not applicable 70x Wireless Mode Not Supported The system has detected a wireless module installed in the system that is not supported and has been disabled Replace with a supported modul...

Страница 125: ... has proper airflow 90E Power Supply Fan Not detected Power supply fan is not connected or may have malfunctioned 1 Reseat power supply fan 2 Reseat fan cable 3 Replace power supply fan 910 Filter Warning Airflow filter is dirty Replace the airflow filter Interpreting system validation diagnostic front panel LEDs and audible codes During the system validation phase that occurs at system startup th...

Страница 126: ...e 2 4 The embedded controller is checking or recovering the boot block Hardware 3 2 The embedded controller has timed out waiting for BIOS to return from memory initialization 3 3 The embedded controller has timed out waiting for BIOS to return from graphics initialization 3 4 The system board displays a power failure crowbar 3 5 The processor is not detected 3 6 The processor does not support an ...

Страница 127: ...OS button with power removed will reset the BIOS settings to factory defaults It may be useful to back up the BIOS settings or save them as custom defaults before resetting them in case they are needed later Back up can be performed in Computer Setup or using the BiosConfigUtility tool available from www hp com See Computer Setup F10 Utility on page 65 for information on backing up the BIOS settin...

Страница 128: ...rged of static electricity by briefly touching a grounded metal object See the Safety Regulatory Information guide for more information 3 Remove the access panel 4 Locate the header and jumper NOTE The password jumper is green so that it can be easily identified For assistance locating the password jumper and other system board components see the system board components image at System board callo...

Страница 129: ... electricity by briefly touching a grounded metal object See the Safety Regulatory Information guide for more information 3 Remove the access panel CAUTION Pushing the CMOS button will reset CMOS values to factory defaults It is important to back up the computer CMOS settings before resetting them in case they are needed later Back up is easily done through Computer Setup See Computer Setup F10 Ut...

Страница 130: ...ics Windows select More and then select Run as administrator or To access HP PC Hardware Diagnostics Windows from HP Support Assistant a Type support in the taskbar search box and then select the HP Support Assistant app or Select the question mark icon in the taskbar b Select Troubleshooting and fixes c Select Diagnostics and then select HP PC Hardware Diagnostics Windows 2 When the tool opens se...

Страница 131: ... it to the computer desktop or To run the tool from a USB flash drive download it to a USB flash drive 4 Select Run Installing HP PC Hardware Diagnostics Windows To install HP PC Hardware Diagnostics Windows follow these steps Navigate to the folder on your computer or the flash drive where the exe file was downloaded double click the exe file and then follow the on screen instructions Using HP PC...

Страница 132: ...PC Hardware Diagnostics UEFI download instructions are provided in English only and you must use a Windows computer to download and create the HP UEFI support environment because only exe files are provided Downloading the latest HP PC Hardware Diagnostics UEFI version To download the latest HP PC Hardware Diagnostics UEFI version to a USB flash drive 1 Go to http www hp com go techcenter pcdiags ...

Страница 133: ...ollow these steps 1 Go to http www hp com support 2 Select Get software and drivers enter the product name or number select your computer and then select your operating system 3 In the Diagnostics section follow the on screen instructions to select and download the Remote UEFI version for the product Customizing Remote HP PC Hardware Diagnostics UEFI settings Using the Remote HP PC Hardware Diagno...

Страница 134: ... Make your customization selections 4 Select Main and then Save Changes and Exit to save your settings Your changes take effect when the computer restarts 124 Chapter 10 Using HP PC Hardware Diagnostics ...

Страница 135: ...ttery can be extended by plugging the computer into a live AC outlet The lithium battery is only used when the computer is NOT connected to AC power HP encourages customers to recycle used electronic hardware HP original print cartridges and rechargeable batteries For more information about recycling programs go to http www hp com recycle 1 Remove disengage any security devices that prohibit openi...

Страница 136: ...he battery holder automatically secures the battery in the proper position Type 2 a To release the battery from its holder squeeze the metal clamp that extends above one edge of the battery 1 When the battery pops up lift it out 2 126 Appendix A Battery replacement ...

Страница 137: ...ove the battery 2 b Insert the new battery and position the clip back into place NOTE After the battery has been replaced use the following steps to complete this procedure 8 Replace the computer access panel 9 Reconnect the power cord and any external devices and then turn on the computer 10 Reset the date and time your passwords and any special system setups using Computer Setup 11 Lock any secu...

Страница 138: ...cy responsible for evaluation in the country where the power cord set will be installed 2 The power cord set must have a minimum current capacity of 10A 7A Japan only and a nominal voltage rating of 125 or 250 volts AC as required by each country s power system 3 The diameter of the wire must be a minimum of 0 75 mm2 or 18AWG and the length of the cord must be between 1 8 m 6 feet and 3 6 m 12 fee...

Страница 139: ... set fittings appliance coupler and wall plug must bear the certification mark of the agency responsible for evaluation in the country where it will be used 2 The flexible cord must be Type SVT or equivalent No 18 AWG 3 conductor The wall plug must be a two pole grounding type with a NEMA 5 15P 15A 125V or NEMA 6 15P 15A 250V configuration 3 Appliance coupler flexible cord and wall plug must bear ...

Страница 140: ... page 132 NOTE After you set up the operating system make sure that the latest BIOS drivers and software updates are installed CAUTION Do not add optional hardware or third party devices to the workstation until the operating system is successfully installed Adding hardware might cause errors and prevent the operating system from installing correctly System RAM HP supports different amounts of tot...

Страница 141: ...or audio output instead of the DisplayPort Check the audio settings for example Sound in gnome control center In some systems embedded Intel HD graphics may also present a similar HDMI audio device that can be used through the DisplayPort interface No proprietary driver is needed for this device just a sufficiently recent kernel Hyper Threading Technology The Z Series Workstations support Hyper Th...

Страница 142: ...n source versions of the Nouveau and DRM drivers Open source versions of Nouveau drivers and NVIDIA drivers cannot coexist in the same runtime environment because they use the same hardware resources If administrators create their own Linux environments using NVIDIA drivers but choose not to use HP packaged versions HP recommends that they manually append the following boot loader parameters to pr...

Страница 143: ...odule is amdgpu and may be present in newer kernels even without the vendor driver because it is an open source modesetting module In order to achieve the best hardware acceleration for OpenGL and other APIs the AMD advanced vendor driver usually called amdgpu pro is recommended AMD packages this driver for specific Linux releases and posts them on their website For enterprise Linux distributions ...

Страница 144: ...beginning steps in this chapter Current BIOS steps 1 Follow steps a through l below to restore the nonvolatile memory that can contain personal data Restoring or reprogramming nonvolatile memory that does not store personal data is neither necessary nor recommended a Turn on or restart the computer and then press esc while the Press the ESC key for Startup Menu message is displayed at the bottom o...

Страница 145: ...tform Module TPM and or fingerprint reader one or two prompts will appear one to clear the TPM and the other to Reset Fingerprint Sensor press or tap F1 to accept or F2 to reject l Remove all power and system batteries for at least 24 hours 2 Complete one of the following Remove and retain the storage drive or Clear the drive contents by using a third party utility designed to erase data from an S...

Страница 146: ...4 KBytes not customer accessible No Yes Stores NIC configuration and NIC firmware NIC EEPROM is programmed using a utility from the NIC vendor that can be run from DOS A utility is required to write data to this memory and is available from the NIC vendor Writing data to this ROM in an inappropriate manner will render the NIC non functional DIMM Serial Presence Detect SPD configuration data 256 By...

Страница 147: ...pplied using this utility Bluetooth flash select products only 2 Mbit No Yes Stores Bluetooth configuration and firmware Bluetooth flash is programmed at the factory Tools for writing data to this memory are not publicly available but can be obtained from the silicon vendor A utility is required for writing data to this memory and is made available through newer versions of the driver whenever the...

Страница 148: ...diagnostics The UEFI BIOS provides functionality beyond that of the legacy BIOS In addition the UEFI BIOS works to initialize the computer s hardware before loading and executing the OS the run time environment allows the loading and execution of software programs from storage devices to provide more functionality such as advanced hardware diagnostics with the ability to display more detailed syst...

Страница 149: ...oot Keys a Turn on or restart the computer and then press esc while the Press the ESC key for Startup Menu message is displayed at the bottom of the screen b Select the Security menu select Secure Boot Configuration and then follow the on screen instructions c At the Secure Boot Configuration window select Secure Boot select Clear Secure Boot Keys and then follow the on screen instructions to cont...

Страница 150: ...t max inlet temperature Operating 5 90 5 90 Non operating 5 90 5 90 Maximum altitude Operating 16 404 ft 5000 m Non operating 50 000 ft 15 240 m Power supply 80 PLUS Platinum 250W 400W active PFC 90 92 89 efficient at 20 50 100 load 115V 91 93 90 efficient at 20 50 100 load 230V Operating voltage range 90 264 VAC Rated voltage range 100 240 VAC Rated line frequency 50 60 Hz Operating line frequenc...

Страница 151: ... 37 38 installation 37 38 locations 37 dust filter 24 E electrostatic discharge ESD 9 preventing damage 10 error codes 110 115 messages 110 expansion card installation 26 removal 26 F F10 Setup access problem 80 fan illustrated 6 removal and replacement 30 fan sink illustrated 6 removal and replacement 55 fan power supply 14 flash drive problems 103 flashing LEDs 115 flex port module removal and r...

Страница 152: ... 80 hard drive 85 hardware installation 96 Internet access 104 keyboard 94 Media Card Reader 86 memory 99 monitor 88 mouse 94 network 97 power 84 printer 93 software 105 processor removal and replacement 56 processors illustrated 6 product ID location 4 R rear panel components 3 Remote HP PC Hardware Diagnostics UEFI settings customizing 123 using 123 removing 2 5 inch hard drive 50 3 5 inch hard ...

Страница 153: ...d connections 25 system memory removing personal data from volatile 134 T temperature control 11 tools servicing 14 Torx T15 screwdriver 14 TPM settings 108 V ventilation proper 11 W wireless antennas disconnecting 57 WLAN module removal 57 spare part number 57 Index 143 ...

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