dc7800 Illustrated Parts & Service Map, SFF Chassis
459786-001
page 4
Failsafe Boot Block ROM
The computer comes with a reprogrammable flash system ROM (read only memory). To
upgrade the ROM, download the latest ROM BIOS image from the HP Web site (www.hp.com)
and follow the online GUI/instructions.
Your system ROM includes a Failsafe Boot Block that is protected during the flash process and
allows the computer to be restarted in the unlikely event of an unsuccessful ROM flash.
If the system detects an invalid system ROM during the boot sequence, the Failsafe Boot Block
attempts to locate a valid BIOS image on removable media. To recover from the Boot Block
recovery mode complete the following steps:
Boot Block Recovery
1. Remove any bootable media from the computer and turn off power.
2. Insert a flash drive or CD containing the ROM BIOS in the root directory. The media must be
formatted using the FAT12, FAT16, or FAT32 file system.
3. Turn on power to the system.
4. The system will automatically flash the ROM. After a successful flash, the system will either
automatically restart or prompt the user to unplug the unit, wait 5 seconds, reattach the power
cord, and then press the power button.
NOTE: BitLocker prevents Windows Vista from booting when a CD containing the BIOS image
file is in an optical drive. If BitLocker is enabled, remove this CD before attempting to boot to
Windows Vista.
Password Security
Establishing a Setup password:
1. Turn on or restart the computer. If you are in Windows, click
Start > Shut Down > Restart
.
2. As soon as the computer is turned on, press
F10
when the monitor light turns green to enter
Computer Setup. Press
Enter
to bypass the title screen, if necessary. If you do not press
F10
when prompted, a restart will be necessary.
3. Select
Security > Setup Passwor
d and follow the instructions on the screen.
4. Before exiting, click
File > Save Changes and Exit
.
Changing a password:
1. Turn on or restart the computer. If you are in Windows, click
Start > Shut Down > Restart
.
To change the Setup password, go to step 2.
To change the Power-on password, go to step 3.
2. To change the Setup password, as soon as the computer is turned on, press
F10
when the
monitor light turns green to enter Computer Setup. Press
Enter
to bypass the title screen, if
necessary.
3. When the key icon appears, type your current password, a slash (/) or alternate delimiter
character, your new password, another slash (/) or alternate delimiter character, and your new
password again as shown:
current password/new password/new password
.
NOTE: Type the new password carefully since the characters do not appear on the screen.
4. Press
Enter
.
The new password will take effect the next time the computer is restarted.
Deleting a password
1. Turn on or restart the computer. If you are in Windows, click
Start > Shut Down > Restart
.
To delete the Setup password, go to step 2.
To delete the Power-On password, go to step 3.
2. To change the Setup password, as soon as the computer is turned on, press
F10
when the
monitor light turns green to enter Computer Setup. Press
Enter
to bypass the title screen, if
necessary.
3. When the key icon appears, type your current password followed by a slash (/) or alternate
delimiter character as shown. Example:
currentpassword/
4. Press
Enter
.
Security Features
NOTE: For more information about Setup Utilities refer to the Computer Setup Menu on the
previous page or in the
Service Reference Guide
.
Diagnostic Functions
Diagnostic functions are provided by the Setup Utility (in system ROM) and by Insight Diag-
nostics. Insight Diagnostics provides detailed system information including:
•
Processor type and speed
•
Memory amount, mapping, and integrity
•
Hardware peripheral availability/settings
•
Hard drive type, space used/available
•
System identification, asset tracking
Insight Diagnostics may be found on the
Documentation and Diagnostics
CD that shipped with
the computer. The tool may also be downloaded from the hp Web site using the following pro-
cedure:
1. Go to www.hp.com
2. Click the
Software & Download driver
link.
3. Enter the product number (for example, dc7800) in the text box and press the
Enter
key.
4. Select the specific product.
5. Select the OS.
6. Click the
Diagnostics
link.
7. Select
HP Insight Diagnostics Offline Edition
.
8. Select the proper language and click
Download
.
NOTE: The download includes instructions on how to create a bootable CD.
Clearing CMOS
1. Turn off the computer and any external devices, and disconnect the power cord from the
power outlet.
2. Remove the chassis access panel.
3. On the system board, press and hold the CMOS button for 5 seconds.
4. Replace the chassis access panel and reconnect the power cord.
Error Conditions and Messages
Feature
Purpose
How It Is
Established
Floppy drive controller
Prevents the transfer of data to or from the
floppy drive.
Setup Utilities
Device Boot Disabling
Prevents booting from and or all of these
devices: Internal or external USB, Internal
ODD, or Internal FDD
Setup Utilities
Security Option
Prevents use of computer until password is
entered. Can apply to both initial startup and
restart.
Setup Utilities
BIOS Write Protect
Restricts ability to change ROM BIOS with-
out approval.
Setup Utilities.
USB Controller
Allows you to disable or enable all USB
devices.
Setup Utilities
Diagnostic LEDs
LED
Color
LED Activity
State/Message
Power
Green
On
Computer on
Power
Green
1 blink every 2 seconds
Normal Suspend Mode
Power
Red
1 blink every second followed
by a 2 second pause
CPU thermal shutdown
Power
Red
3 blinks, 1 blink every second
followed by a 2 second pause
Processor not installed
Power
Red
4 blinks, 1 blink every second
followed by a 2 second pause
Power failure (power supply overload)
Power
Red
5 blinks, 1 blink every second
followed by a 2 second pause
Pre-video memory error
Power
Red
6 blinks, 1 blink every second
followed by a 2 second pause
Pre-video graphics error
Power
Red
7 blinks, 1 blink every second
followed by a 2 second pause
System board failure (ROM
Power
Red
8 blinks, 1 blink every second
followed by a 2 second pause
Invalid ROM based on Checksum
Power
Red
9 blinks, 1 blink every second
followed by a 2 second pause
System powers on but is unable to boot
Power
Red
10 blinks, 1 blink every second
followed by a 2 second pause
Bad option card
Power
Red
11 blinks, 1 blink every second
followed by a 2 second pause
The current processor does not support
a feature previously enabled on this
system.
none
none
System does not power on and
LEDs are not flashing
System unable to power on
Common POST Error Messages
Screen Message
Probable Cause
Recommended Action
101-Option ROM Error
1. System ROM checksum
error.
2. Expansion board option
ROM checksum
3. System board
1. Verify ROM, reflash if required
2. Remove suspected card, reboot
3. Clear CMOS memory, reboot
4. Replace system board
103-System Board
Failure
DMA, timers
1. Clear CMOS memory.
2. Remove expansion boards.
3. Replace system board.
164-Memory Size Error
and
201-Memory Error
Incorrect memory configu-
ration
1. Run Setup (F10).
2. Check DIMMs for proper
seating, type, and HP
compatibility.
3. Remove DIMMs singularly and
reboot to isolate faulty DIMM.
4. Replace system board.
214-DIMM Configura-
tion Warning
Populated DIMM configura-
tion is not optimized
Rearrange the DIMMs so that
each channel has the same amount
of memory.
301-, 304-Keyboard error
Keyboard failure.
Check keyboard connection or
keys. Check connector for bent of
missing pins. Replace keyboard. If
304, possible system board prob-
lem.
501-Display Adapter
Failure
Graphics display controller.
1. Reseat graphics card.
2. Clear CMOS.
3. Check monitor connection.
4. Replace graphics card.
1720-SMART Hard Drive
Detects Imminent Failure
Hard drive is about to fail.
1. Determine if hard drive is
giving correct error message.
Enter Computer Setup and run
the Drive Protection System
test under
Storage > DPS Self-
test
.
2. Apply hard drive firmware
patch if applicable.
3. Back up contents and replace
hard drive.
1796-SATA Cabling Error One or more SATA devices
are improperly attached. For
optimal performance, the
SATA 0 and SATA 1 con-
nectors must be used before
SATA 2 and SATA 3.
Ensure SATA connectors are used
in ascending order. For one
device, use SATA 0. For two
devices, use SATA 0 and SATA 1.
For three devices, use SATA 0,
SATA1, and SATA 2.
1801-Microcode Patch
Error
Processor not supported by
ROM BIOS.
1. Upgrade BIOS to proper
version.
2. Change the processor.
