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Dell Inspiron 14 7420 2-in-1, Service Manual

The Dell Inspiron 14 7420 2-in-1 is a versatile and powerful laptop that offers seamless performance and impressive features. Unlock the full potential of this device by accessing the comprehensive Service Manual, available for free download at manualshive.com. Find step-by-step instructions, troubleshooting tips, and more to ensure optimal use of your laptop.

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Steps

1. Align and place the system board on the palm-rest and keyboard assembly.
2. Replace the two screws (M2x2) that secure the system board to the palm-rest and keyboard assembly.
3. Connect the display cable to the connector on the system board and close the latch to secure the cable.
4. Connect the keyboard-backlight cable into the connector on the system board and close the latch to secure the cable.
5. Connect the keyboard cable to the connector on the system board and close the latch to secure the cable.
6. Connect the touchpad cable to the connector on the system board and close the latch to secure the cable.
7. Connect the I/O-board cable to the connector on the system board and close the latch to secure the cable.

Removing and installing components

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Summary of Contents for Inspiron 14 7420 2-in-1

Page 1: ...Inspiron 14 7420 2 in 1 Service Manual Regulatory Model P161G Regulatory Type P161G001 March 2022 Rev A00 ...

Page 2: ...ential damage to hardware or loss of data and tells you how to avoid the problem WARNING A WARNING indicates a potential for property damage personal injury or death 2022 Dell Inc or its subsidiaries All rights reserved Dell EMC and other trademarks are trademarks of Dell Inc or its subsidiaries Other trademarks may be trademarks of their respective owners ...

Page 3: ... 18 Installing the 4 cell battery 54 Wh 19 Coin cell battery 20 Removing the coin cell battery 20 Installing the coin cell battery 21 Memory 22 Removing the memory 22 Installing the memory 23 Wireless card 25 Removing the wireless card 25 Installing the wireless card 25 Solid state drive 27 Removing the M 2 2230 solid state drive 27 Installing the M 2 2230 solid state drive 28 Removing the M 2 228...

Page 4: ...r 4 System setup 58 Entering BIOS setup program 58 Navigation keys 58 Boot Sequence 58 System setup options 59 System and setup password 68 Assigning a system setup password 69 Deleting or changing an existing system setup password 69 Clearing BIOS System Setup and System passwords 69 Updating the BIOS 70 Updating the BIOS in Windows 70 Updating the BIOS using the USB drive in Windows 70 Updating ...

Page 5: ...screen b Press any key to continue c If the AC adapter is not disconnected a message prompting you to remove the AC adapter appears on the screen Remove the AC adapter and then press any key to continue the Service Mode procedure The Service Mode procedure automatically skips the following step if the Owner Tag of the computer is not set up in advance by the user d When the ready to proceed messag...

Page 6: ...Due to the increased density of semiconductors used in recent Dell products the sensitivity to static damage is now higher than in previous Dell products For this reason some previously approved methods of handling parts are no longer applicable Two recognized types of ESD damage are catastrophic and intermittent failures Catastrophic Catastrophic failures represent approximately 20 percent of ESD...

Page 7: ...ounds if the test fails Insulator Elements It is critical to keep ESD sensitive devices such as plastic heat sink casings away from internal parts that are insulators and often highly charged Working Environment Before deploying the ESD Field Service kit assess the situation at the customer location For example deploying the kit for a server environment is different than for a desktop or portable ...

Page 8: ...and ensure that no stray screws remain inside your computer 2 Connect any external devices peripherals or cables you removed before working on your computer 3 Replace any media cards discs or any other parts that you removed before working on your computer 4 Connect your computer and all attached devices to their electrical outlets NOTE To exit service mode ensure to connect the AC adapter to the ...

Page 9: ...s and correct screw type is restored when the component is replaced NOTE Some computers have magnetic surfaces Ensure that the screws are not left attached to such surfaces when replacing a component NOTE Screw color may vary with the configuration ordered Table 1 Screw list Component Screw type Quantity Screw image Base cover M2x4 4 Base cover Captive screw 3 Battery M2x3 3 For computers shipped ...

Page 10: ...oard M2x3 2 Display hinges M2 5x4 6 Power button Power button with fingerprint reader M2x3 2 USB Type C bracket M2x4 2 System board M2x2 2 Major components of Inspiron 7420 2 in 1 The following image shows the major components of Inspiron 7420 2 in 1 10 Removing and installing components ...

Page 11: ...ase cover 2 USB Type C bracket 3 System board 4 I O board cable 5 Speakers 6 Battery 7 Touchpad bracket 8 Memory 9 Palm rest and keyboard assembly 10 Display assembly Removing and installing components 11 ...

Page 12: ...ing to warranty coverages purchased by the customer Contact your Dell sales representative for purchase options Base cover Removing the base cover Prerequisites 1 Follow the procedure in Before working inside your computer NOTE Ensure that your computer is in Service Mode For more information see step 6 in Before working inside your computer About this task The following images indicate the locati...

Page 13: ...Removing and installing components 13 ...

Page 14: ...e top left corner at the hinge pry the base cover to release the base cover from the palm rest and keyboard assembly 4 Peel the tape that secures the battery cable to the system board and disconnect the battery cable from the system board Installing the base cover Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this ta...

Page 15: ...Removing and installing components 15 ...

Page 16: ...crews that secure the base cover to the palm rest and keyboard assembly Next steps 1 Follow the procedure in After working inside your computer Battery Lithium ion battery precautions CAUTION Exercise caution when handling Lithium ion batteries Discharge the battery completely before removing it Disconnect the AC power adapter from the system and operate the computer solely on battery power the ba...

Page 17: ...tteries from www dell com or authorized Dell partners and resellers Swollen batteries should not be used and should be replaced and disposed properly For guidelines on how to handle and replace swollen Lithium ion batteries see Handling swollen Lithium ion batteries Removing the 3 cell battery 41 Wh Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the base cover...

Page 18: ...e three screws M2x3 that secure the battery to the palm rest and keyboard assembly 3 Connect the battery cable to the system board 4 Adhere the tape that secures the battery cable to the system board Next steps 1 Install the base cover 2 Follow the procedure in After working inside your computer Removing the 4 cell battery 54 Wh Prerequisites 1 Follow the procedure in Before working inside your co...

Page 19: ...rest and keyboard assembly 4 Lift the battery off the palm rest and keyboard assembly Installing the 4 cell battery 54 Wh Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the battery and provides a visual representation of the installation procedure Removing and in...

Page 20: ...in After working inside your computer Coin cell battery Removing the coin cell battery Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the base cover About this task NOTE Removing the coin cell battery resets the BIOS setup program s settings to default It is recommended that you note the BIOS setup program s settings before removing the coin cell battery The f...

Page 21: ...embly Installing the coin cell battery Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the coin cell battery and provides a visual representation of the installation procedure Removing and installing components 21 ...

Page 22: ...ase cover 2 Follow the procedure in After working inside your computer Memory Removing the memory Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the base cover About this task The following image indicates the location of the memory and provides a visual representation of the removal procedure 22 Removing and installing components ...

Page 23: ...emory slot NOTE Repeat step 1 to step 3 to remove any other memory module installed in your computer Installing the memory Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the memory and provides a visual representation of the installation procedure Removing and in...

Page 24: ...to the memory slot 4 Press the memory module down until it clicks into place NOTE If you do not hear the click remove the memory module and reinstall it NOTE Repeat step 1 to step 4 to install any other memory module in your computer Next steps 1 Install the base cover 2 Follow the procedure in After working inside your computer 24 Removing and installing components ...

Page 25: ...cedure Steps 1 Remove the screw M2x3 that secures the wireless card bracket to the wireless card and system board 2 Lift the wireless card bracket off the wireless card 3 Disconnect the antenna cables from the wireless card 4 Slide and remove the wireless card from the wireless card slot Installing the wireless card Prerequisites If you are replacing a component remove the existing component befor...

Page 26: ...color Silkscreen marking Main White MAIN white triangle Auxiliary Black AUX black triangle 2 Align the notch on the wireless card with the tab on the wireless card slot and insert the wireless card at an angle into the wireless card slot 3 Align the screw hole on the wireless card bracket with the screw hole on the wireless card and palm rest and keyboard assembly 4 Replace the screw M2x3 that sec...

Page 27: ...e M 2 card installed on your computer will depend on the configuration ordered Supported card configurations on the M 2 card slot M 2 2230 solid state drive 2230 mounting bracket M 2 2280 solid state drive The following image indicates the location of the M 2 2230 solid state drive and provides a visual representation of the removal procedure Removing and installing components 27 ...

Page 28: ...state drive off the mounting bracket Installing the M 2 2230 solid state drive Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task NOTE The M 2 card installed on your computer will depend on the configuration ordered Supported card configurations on the M 2 card slot M 2 2230 solid state drive 2230 mounting brack...

Page 29: ...e the M 2 2230 solid state drive and its mounting bracket on the system board 5 Replace the screw M2x3 that secures the M 2 thermal plate to the palm rest and keyboard assembly Next steps 1 Install the base cover 2 Follow the procedure in After working inside your computer Removing the M 2 2280 solid state drive Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove t...

Page 30: ...ard assembly 2 Slide and remove the solid state drive from the solid state drive slot Installing the M 2 2280 solid state drive Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task NOTE The M 2 card installed on your computer will depend on the configuration ordered Supported card configurations on the M 2 card sl...

Page 31: ...ng inside your computer Speakers Removing the speakers Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the base cover 3 Remove the 3 cell battery 41 Wh or the 4 cell battery 54 Wh whichever applicable 4 Remove the wireless card About this task NOTE The antenna cable of Wireless Local Area Network and speaker cable are combined as an assembly The following image...

Page 32: ...the speaker cable from the routing guides on the palm rest and keyboard assembly 5 Lift the speakers along with the cables off the palm rest and keyboard assembly Installing the speakers Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the speakers and provides a v...

Page 33: ...tall the 3 cell battery 41 Wh or the 4 cell battery 54 Wh whichever applicable 2 Install the wireless card 3 Install the base cover 4 Follow the procedure in After working inside your computer Heat sink Removing the heat sink without discrete graphics Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the base cover About this task NOTE The heat sink may become ho...

Page 34: ...f you are replacing a component remove the existing component before performing the installation procedure About this task NOTE Incorrect alignment of the heat sink can damage the system board and processor NOTE If either the system board or the heat sink is replaced use the thermal pad paste provided in the kit to ensure that thermal conductivity is achieved NOTE This procedure only applies if yo...

Page 35: ...r computer 2 Remove the base cover About this task NOTE The heat sink may become hot during normal operation Allow sufficient time for the heat sink to cool before you touch it NOTE For maximum cooling of the processor do not touch the heat transfer areas on the heat sink The oils in your skin can reduce the heat transfer capability of the thermal grease NOTE This procedure applies only for comput...

Page 36: ... About this task CAUTION Incorrect alignment of the heat sink can damage the system board and processor NOTE If either the system board or the heat sink is replaced use the thermal pad paste provided in the kit to ensure that thermal conductivity is achieved NOTE This procedure only applies if you are installing a heat sink for a computer with a discrete graphics processor The following image indi...

Page 37: ...1 Install the base cover 2 Follow the procedure in After working inside your computer Display assembly Removing the display assembly Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the base cover About this task The following image indicates the location of the display assembly and provides a visual representation of the removal procedure Removing and installin...

Page 38: ...38 Removing and installing components ...

Page 39: ...and keyboard assembly 6 Pry open the right display hinge at an angle of 90 degrees 7 Gently lift the palm rest and keyboard assembly off the display assembly CAUTION To avoid damaging the display do not slide the palm rest and keyboard assembly over the display assembly Installing the display assembly Prerequisites If you are replacing a component remove the existing component before performing th...

Page 40: ...40 Removing and installing components ...

Page 41: ...ce the two screws M2 5x4 that secure the left display hinge to the palm rest and keyboard assembly 5 Close the right display hinge and align the screw holes on the right display hinge with the screw holes on the system board 6 Replace the four screws M2 5x4 that secure the right display hinge to the palm rest and keyboard assembly 7 Connect the display cable to the connector on the system board an...

Page 42: ...ble from the system board 2 Remove the two screws M2x3 that secure the fan to the palm rest and keyboard assembly 3 Lift the fan off the palm rest and keyboard assembly Installing the fan Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the fan and provides a visua...

Page 43: ...m board Next steps 1 Install the base cover 2 Follow the procedure in After working inside your computer I O board Removing the I O board Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the base cover About this task The following image indicates the location of the I O board and provides a visual representation of the removal procedure Removing and installing ...

Page 44: ...his step is only applicable to computers shipped with the optional fingerprint reader 6 Disconnect the coin cell battery cable from the I O board 7 Remove the two screws M2x3 that secure the I O board to the palm rest and keyboard assembly 8 Lift the I O board off the palm rest and keyboard assembly Installing the I O board Prerequisites If you are replacing a component remove the existing compone...

Page 45: ... the I O board and close the latch NOTE This step is only applicable to computers shipped with the optional fingerprint reader 7 Connect the coin cell battery cable to the I O board 8 Close the left display hinge and align the screw holes on the left display hinge with the screw holes on the I O board 9 Replace the two screws M2 5x4 that secure the left display hinge to the I O board Next steps 1 ...

Page 46: ...est and keyboard assembly 2 Lift the power button off the slot on the palm rest and keyboard assembly Installing the power button Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task NOTE This procedure is applicable only when you are installing a power button without the optional fingerprint reader The following ...

Page 47: ...mputer Removing the power button with fingerprint reader Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the base cover 3 Remove the heat sink 4 Remove the fan 5 Remove the display assembly 6 Remove the I O board About this task NOTE This procedure is applicable only for computers that are shipped with a fingerprint reader on the power button The following imag...

Page 48: ...st and keyboard assembly Installing the power button with fingerprint reader Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task NOTE This procedure is applicable only when you are installing a power button with fingerprint reader into your computer The following image indicates the location of the power button w...

Page 49: ...play assembly 3 Install the fan 4 Install the heat sink 5 Install the base cover 6 Follow the procedure in After working inside your computer System board Removing the system board Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the base cover 3 Remove the 3 cell battery 41 Wh or the 4 cell battery 54 Wh whichever applicable 4 Remove the memory 5 Remove the wir...

Page 50: ...yboard backlight cable 3 Keyboard cable 4 Touchpad cable 5 Speaker cable 6 M 2 card slot for solid state drive 7 M 2 card slot for wireless card 8 I O board cable 9 Fan cable The following image indicates the location of the system board and provides a visual representation of the removal procedure 50 Removing and installing components ...

Page 51: ...est and keyboard assembly 3 Open the hinge at an angle of 90 degrees 4 Remove the two screws M2x4 that secure the USB Type C bracket to the system board and palm rest and keyboard assembly 5 Lift the USB Type C port bracket off the system board and palm rest and keyboard assembly 6 Open the latch and disconnect the keyboard backlight cable from the system board Removing and installing components 5...

Page 52: ...m board to the palm rest and keyboard assembly 12 Lift the system board off the palm rest and keyboard assembly Installing the system board Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the connectors on your system board Figure 2 System board connectors The following image ind...

Page 53: ...able 4 Connect the keyboard backlight cable into the connector on the system board and close the latch to secure the cable 5 Connect the keyboard cable to the connector on the system board and close the latch to secure the cable 6 Connect the touchpad cable to the connector on the system board and close the latch to secure the cable 7 Connect the I O board cable to the connector on the system boar...

Page 54: ...er applicable 7 Install the base cover 8 Follow the procedure in After working inside your computer Palm rest and keyboard assembly Removing the palm rest and keyboard assembly Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the base cover 3 Remove the 3 cell battery 41 Wh or the 4 cell battery 54 Wh whichever applicable 4 Remove the coin cell battery 5 Remove ...

Page 55: ...eyboard assembly Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the palm rest and keyboard assembly and provides a visual representation of the installation procedure Removing and installing components 55 ...

Page 56: ...on with fingerprint reader 4 Install the fan 5 Install the speakers 6 Install the I O board 7 Install the M 2 2230 solid state drive or M 2 2280 solid state drive whichever applicable 8 Install the wireless card 9 Install the coin cell battery 10 Install the 3 cell battery 41 Wh or the 4 cell battery 54 Wh whichever applicable 11 Install the base cover 12 Follow the procedure in After working insi...

Page 57: ...rivers and downloads When troubleshooting downloading or installing drivers it is recommended that you read the Dell Knowledge Based article Drivers and Downloads FAQ 000123347 3 Drivers and downloads 57 ...

Page 58: ...k Turn on or restart your computer and press F2 immediately Navigation keys NOTE For most of the System Setup options changes that you make are recorded but do not take effect until you restart the system Table 3 Navigation keys Keys Navigation Up arrow Moves to the previous field Down arrow Moves to the next field Enter Selects a value in the selected field if applicable or follow the link in the...

Page 59: ... ownership date of the computer Express Service Code Displays the express service code of the computer Ownership Tag Displays the ownership tag of the computer Signed Firmware Update Displays whether the signed firmware update is enabled Default Enabled Battery Displays the battery health information Primary Displays the primary battery Battery Level Displays the battery level Battery State Displa...

Page 60: ...of the computer Video BIOS Version Displays the video BIOS version of the computer Audio Controller Displays the audio controller information of the computer Bluetooth Device Displays whether a Bluetooth device is installed in the computer dGPU Video Controller Displays the discrete graphics controller Table 5 System setup options Boot Configuration menu Boot Configuration Boot Sequence Boot Mode ...

Page 61: ...te take effect immediately Time Sets the computer time in HH MM SS 24 hour format You can switch between 12 hour and 24 hour clock Changes to the time take effect immediately Camera Enable Camera Enables or disables the camera By default Enable Camera is selected Audio Enable Audio Enables or disables all integrated audio controller Default ON Enable Microphone Enables or disables microphone By de...

Page 62: ...menu Display Display Brightness Brightness on battery power Sets the screen brightness when the computer is running on battery power Default 50 Brightness on AC power Sets the screen brightness when the computer is running on AC power Default 100 Touchscreen Touchscreen Enables or disables the touchscreen Default ON Full Screen Logo When turned on the full screen logo is displayed if the image mat...

Page 63: ...zed Standard settings for cooling fan and processor heat management This setting is a balance of performance noise and temperature USB Wake Support Wake on Dell USB C Dock Enables connecting a Dell USB C Dock to wake the computer from Standby Default ON Block Sleep Blocks the computer from entering Sleep S3 mode in the operating system Default OFF NOTE If enabled the computer will not go to sleep ...

Page 64: ...tence Module service from Absolute Software Default Enabled UEFI Boot Path Security Determines if the system will prompt the user to enter the admin password if set when booting to a UEFI boot path device frim the F12 boot menu Default Always Except Internal HDD Table 12 System setup options Passwords menu Passwords Password Configuration Digit Enforces password restriction that the password must ...

Page 65: ...nnot work in the event of EC corruption ME corruption or a hardware issue The recovery image must exist on an unencrypted partition on the drive BIOS Downgrade Allow BIOS Downgrade Controls flashing of the system firmware to previous revisions Default ON SupportAssist OS Recovery Enables or disables the boot flow for SupportAssist OS Recovery tool in the event of certain system error Default ON BI...

Page 66: ...f function keys F1 F12 Default Lock Mode Secondary Keyboard Illumination Enables the user to change the keyboard illumination settings Default Bright Keyboard Backlight Timeout on AC Enables the user to define the timeout value for the keyboard backlight when an AC adapter is plugged into the system Default 1 minute Keyboard Backlight Timeout on Battery Enables the user to define the timeout value...

Page 67: ...ovides virtualization for memory map I O Default ON DMA Protection Enable Pre Boot DMA Support Enables the Pre boot DMA protection for internal and external ports Default ON Enable OS Kernel DMA Support Enables the Kernel DMA protection for internal and external ports Default ON Table 18 System setup options Performance menu Performance Multi Core Support Multiple Atom Cores Changes the number of ...

Page 68: ... ON Table 19 System setup options System Logs menu System Logs BIOS Event Log Clear Bios Event Log Select keep or clear BIOS event logs Default Keep Log Thermal Event Log Clear Thermal Event Log Select keep or clear Thermal event logs Default Keep Log Power Event Log Clear Power Event Log Select keep or clear Power event logs Default Keep Log System and setup password Table 20 System and setup pas...

Page 69: ... the System Setup before attempting to delete or change the existing System and or Setup password You cannot delete or change an existing System or Setup password if the Password Status is Locked About this task To enter the System Setup press F12 immediately after a power on or reboot Steps 1 In the System BIOS or System Setup screen select System Security and press Enter The System Security scre...

Page 70: ...to download the latest BIOS setup program file 2 Create a bootable USB drive For more information see the knowledge base article 000145519 at www dell com support 3 Copy the BIOS setup program file to the bootable USB drive 4 Connect the bootable USB drive to the computer that needs the BIOS update 5 Restart the computer and press F12 6 Select the USB drive from the One Time Boot Menu 7 Type the B...

Page 71: ...ot turn off the computer during the BIOS update process The computer may not boot if you turn off your computer Steps 1 From a turn off state insert the USB drive where you copied the flash into a USB port of the computer 2 Turn on the computer and press F12 to access the One Time Boot Menu select BIOS Update using the mouse or arrow keys then press Enter The flash BIOS menu is displayed 3 Click F...

Page 72: ...cks and cells Do not apply pressure to the surface of the battery Do not bend the battery Do not use tools of any type to pry on or against the battery If a battery gets stuck in a device as a result of swelling do not try to free it as puncturing bending or crushing a battery can be dangerous Do not attempt to reassemble a damaged or swollen battery into a laptop Swollen batteries that are covere...

Page 73: ...t power and battery status light patterns and associated problems Table 21 LED codes Diagnostic light codes Amber white Problem description 1 1 TPM detection failure 1 2 Unrecoverable SPI flash failure 1 3 Short in hinge cable tripped OCP1 1 4 Short in hinge cable tripped OCP2 1 5 EC unable to program i Fuse 1 6 EC internal failure 2 1 Processor failure 2 2 System board BIOS or Read Only Memory RO...

Page 74: ...e performance of display power rail and system board These tests are important to evaluate if an LCD or system board needs a replacement 1 M BIST M BIST is the system board built in self test diagnostics tool that improves the diagnostics accuracy of system board embedded controller EC failures M BIST must be manually initiated before POST and can also run on a dead system 2 L BIST L BIST is an en...

Page 75: ...serviceabilitytools Click SupportAssist and then click SupportAssist OS Recovery WiFi power cycle About this task If your computer is unable to access the Internet due to WiFi connectivity issues a WiFi power cycle procedure may be performed The following procedure provides the instructions on how to conduct a WiFi power cycle NOTE Some ISPs Internet Service Providers provide a modem router combo ...

Page 76: ...r Express Service Code at www dell com support For more information on how to find the Service Tag for your computer see Locate the Service Tag on your computer Dell knowledge base articles for a variety of computer concerns 1 Go to www dell com support 2 On the menu bar at the top of the Support page select Support Knowledge Base 3 In the Search field on the Knowledge Base page type the keyword t...

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