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Solving Power Problems

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System does not power on and the LEDs on the front of the computer are not flashing. Cause Solution System unable to power on. 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 on some models, 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 off, then replace the power supply. 6. Replace the system board. Solving Power Problems Common causes and solutions for power problems are listed in the following table. Table D-2 Solving Power Problems Power supply shuts down intermittently. Cause Solution Voltage selector switch on rear of computer chassis (some Select the proper AC voltage using the selector switch. models) not switched to correct line voltage (115V or 230V). Power supply will not turn on because of internal power supply fault. Contact an authorized service provider to replace the power supply. Solving Power Problems 155

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System does not power on and the LEDs on the front of the computer are not flashing.
Cause
Solution
System unable to power on.
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 on some models, 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 off, then
replace the power supply.
6.
Replace the system board.
Solving Power Problems
Common causes and solutions for power problems are listed in the following table.
Table D-2
Solving Power Problems
Power supply shuts down intermittently.
Cause
Solution
Voltage selector switch on rear of computer chassis (some
models) not switched to correct line voltage (115V or 230V).
Select the proper AC voltage using the selector switch.
Power supply will not turn on because of internal power
supply fault.
Contact an authorized service provider to replace the power
supply.
Solving Power Problems
155