HP dc5700 - Manual (Page 164)

C–12 437804-001 Service Reference Guide, dc5700
POST Error Messages
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. Check that the voltage selector (some
models), located on the rear of the
power supply, is set to the appropriate
voltage. Proper voltage setting
depends on your region.
2. 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 5 V_aux light on
the system board is turned on. If it is
turned on, then replace the power
button harness.
5. If the 5 V_aux light on the system
board is not turned on, remove the
expansion cards one at a time until
the 5 V_aux light on the system board
turns on. If the problem persists,
replace the power supply.
POST Diagnostic Front Panel LEDs and Audible Codes (Continued)
Activity Beeps Possible Cause Recommended Action