Table 5-3 Diagnostic Front Panel LEDs and Audible Codes (continued)
Activity Beeps Possible Cause Recommended Action
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.
5 Pre-video memory error. CAUTION: To avoid damage to the memory
modules or the system board, you must unplug
the computer power cord before attempting to
reseat, install, or remove a memory module.
1. Reseat memory modules.
2. Replace memory modules one at a time to
isolate the faulty module.
3. Replace third-party memory with HP
memory.
4. Replace the system board.
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.
6 Pre-video graphics error. 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.
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.
8 Invalid ROM based on
bad checksum.
1. Reflash the system ROM with the latest
BIOS image using the BIOS Recovery
procedure.
2. Replace the system board.
System does not power on
and LEDs are not flashing.
None System unable to power
on.
Press and hold the power button for less than 4
seconds. If the hard drive LED turns green, the
power button is working correctly. Try the
following:
1. Remove the power cord from the computer.
2. Open the computer and press the yellow
CMOS button on the system board for 4
seconds (located near the front USB ports).
3. Verify that the AC cord is plugged into the
power supply.
4. Close the unit and reattach the power cord.
5. Try to power on the computer.
6. Replace the unit.
50 Chapter 5 Diagnostics and Troubleshooting
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