HP Compaq dc7800 USDT Troubleshooting Manual page 62

Table A-2 Diagnostic Front Panel LEDs and Audible Codes (continued)
Activity
Red Power LED flashes five
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
Red Power LED flashes six
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
Red Power LED flashes seven
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
Red Power LED flashes eight
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
Red Power LED flashes nine
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue
until problem is solved.
56 Appendix A POST Error Messages
Beeps Possible Cause
5 Pre-video memory error.
6 Pre-video graphics error.
7 System board failure
(ROM detected failure
prior to video).
8 Invalid ROM based on bad
checksum.
9 System powers on but is
unable to boot.
Recommended Action
3. Replace the power supply.
4. Replace the system board.
OR
The USDT power supply adapter must be at 135W
and use the Smart ID technology before the
system will power up. Replace the power supply
adapter with the HP-supplied USDT power supply
adapter.
CAUTION: To avoid damage to the DIMMs or
the system board, you must unplug the computer
power cord before attempting to reseat, install, or
remove a DIMM module.
1. Reseat DIMMs.
2. Replace DIMMs one at a time to isolate the
faulty module.
3. Replace third-party memory with HP
memory.
4. Replace the system board.
For systems with a graphics card:
1. Reseat the graphics card.
2. Replace the graphics card.
3. Replace the system board.
For systems with integrated graphics, replace the
system board.
Replace the system board.
1. Reflash the system ROM with the latest BIOS
image. See the "Boot Block Emergency
Recovery Mode" section of the Desktop
Management Guide for more information.
2. Replace the system board.
1. Check that the voltage selector, located on
the rear of the power supply (some models),
is set to the appropriate voltage. Proper
voltage setting depends on your region.
2. Unplug the AC power cord from the
computer, wait 30 seconds, then plug the
power cord back in to the computer.
3. Replace the system board.
4. Replace the processor.
ENWW