HP mt22 Maintenance And Service Manual page 81

Table 8-3 Diagnostic front panel LEDs and audible codes (continued)
Activity
Red Power LED flashes six times,
once every second, followed by a
2 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 2 second pause.
Beeps stop after fifth iteration,
but LEDs continue until problem
is solved.
System does not turn on, and
LEDs are not flashing.
Beeps Possible Cause
6 Pre-video graphics error.
8 Invalid ROM based on bad
checksum.
None System unable to turn on.
Interpreting POST diagnostic front panel LEDs and audible codes
Recommended Action
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.
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.
1. Reflash the system ROM with the latest BIOS
image using the BIOS Recovery procedure.
2. Replace the system board.
Press and hold the power button for less than 4
seconds. If the solid-state drive LED turns white, 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 four 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.
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