HP EliteDesk 705 G1 Desktop Mini Maintenance And Service Manual page 217

Activity
but LEDs continue until problem
is solved.
System does not power on and
LEDs are not flashing.
Beeps Possible cause
None System unable to power on.
Interpreting POST diagnostic front panel LEDs and audible codes 207
Recommended action
3. Replace the system board.
Press and hold the power button for less than 4
seconds. If the hard drive LED turns white, 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 white
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. If the
problem persists, replace the system board.
5. If the 5V_aux light on the system board is not
turned on, remove the expansion cards one at
a time until the 5V_aux light on the system
board turns on. It the problem persists, replace
the power supply.