Activity Beeps Possible cause Recommended action
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.
Interpreting POST diagnostic front panel LEDs and audible codes 165
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