HP dx2700 - Microtower PC Service & Reference Manual page 104

Troubleshooting Without Diagnostics
Diagnostic Front Panel LEDs and Audible Codes (Continued)
Activity
System does not
power on and LEDs
are not flashing.
D–24
Beeps Possible Cause
None System unable to
power on.
431672-001
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 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.
Service Reference Guide