HP dc5100 - Microtower PC Service & Reference Manual page 217

Diagnostic Front Panel LEDs and Audible Codes (Continued)
Activity
Red Power LED
flashes ten times,
once every second,
followed by a two
second pause and
the computer beeps
ten times. Beeps
stop after fifth
iteration but LEDs
continue until
problem is
resolved.
System does not
power on and LEDs
are not flashing.
Service Reference Guide, dc5100
Beeps Possible Cause
10 Bad option card.
None System unable to
power on.
376220-001
Recommended Action
1. Check each option card (PCI or PCI
Express) 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.
Press and hold the power button for less
than 4 seconds. If the hard drive LED turns
green, then:
1. Check that the voltage selector,
located on the rear of the power
supply, is set to the appropriate
voltage. Proper voltage setting
depends on your region.
2. Remove the expansion cards one at a
time until the LED light on the system
board turns on.
3. Replace the system board.
OR
Press and hold the power button for less
than 4 seconds. If the hard drive LED does
not turn on green then:
1. Check that the unit is plugged into a
working AC outlet.
2. Open hood and check that the power
button harness is properly connected
to the system board.
3. Check that both power supply cables
are properly connected to the system
board.
4. Check to see if the LED light on the
system board is turned on. If it is
turned on, then replace the power
button harness.
5. If the LED light on the system board is
not turned on, then replace the power
supply.
6. Replace the system board.
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