HP Compaq dc7100 DT Reference Manual page 242

Activity
Red Power LED
flashes nine times,
once every
second, followed
by a two second
pause.
Red Power LED
flashes ten times,
once every
second, followed
by a two second
pause.
System does not
power on and
LEDs are not
flashing.
C–10
Possible
Beeps Cause
9 System powers
on but is unable
to boot.
10 Bad option card.
None System unable to
power on.
361288-003
Recommended Action
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.
Replace the system board.
Replace the processor.
Check each graphics card by removing
the card (one at a time if multiple cards),
then power on the system to see if fault
goes away.
Once a bad card is identified, remove and
replace the bad option card.
Replace the system board.
Press and hold the power button for less
than 4 seconds. If the hard drive LED turns
green, then:
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.
Remove the expansion cards one at a time
until the 3V_aux light on the system board
turns on.
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:
Check that the unit is plugged into a
working AC outlet.
Open hood and check that the power
button harness is properly connected to
the system board.
Check that both power supply cables are
properly connected to the system board.
Check to see if the 3V_aux light on the
system board is turned on. If it is turned
on, then replace the power button harness.
If the 3V_aux light on the system board is
not turned on, then replace the power
supply.
Replace the system board.
Service Reference Guide, dc7100