HP ProDesk 405 G1 Microtower Maintenance And Service Manual page 136

Activity
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.
Red Power LED flashes ten
times, once every second,
followed by a two second
pause. Beeps stop after fifth
iteration but LEDs continue until
problem is solved.
126 Chapter 8 POST error messages
Beeps Possible cause
9 System powers on but is
unable to boot.
10 Bad option card.
Recommended action
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.
1. Check each option card by removing the
card (one at a time if multiple cards), then
power on the system to see if fault goes
away.
2. Once a bad card is identified, remove and
replace the bad option card.
3. Replace the system board.