HP Dx5150 - Compaq Business Desktop Troubleshooting Manual page 74

POST Error Messages
Diagnostic Front Panel LEDs and Audible Codes (Continued)
Activity
System does not
power on and LEDs
are not flashing.
A–10
Possible
Beeps Cause
None System unable
to power on.
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Recommended Action
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 5v_aux 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 5v_aux light on
the system board is turned on. If it is
turned on, then replace the power
button harness.
5. If the 5v_aux light on the system
board is not turned on, then
replace the power supply.
6. Replace the system board.
Troubleshooting Guide