HP ProDesk 600 G4 Micro Maintenance and Service Guide - Page 77

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 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 white then: 1. Check that the unit is plugged into a working AC outlet. 2. Open the access panel and check that the power button cable is properly connected to the system board. 3. Check that the 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 assembly. 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. Power supply shuts down intermittently. Cause If equipped with a voltage selector, voltage selector switch on rear of computer chassis (some models) not switched to correct line voltage (115V or 230V). Power supply will not turn on because of internal power supply fault. Solution Select the proper AC voltage using the selector switch. Replace the power supply. Computer powered off automatically and the Power LED flashes red two times, once every second, followed by a two second pause, and the computer beeps two times. (Beeps stop after fifth iteration but LEDs continue flashing.) Computer powered off automatically and the Power LED flashes red four times and then white two times. Cause Solution Processor thermal protection activated: A fan may be blocked or not turning. OR The heat sink is not properly attached to the processor. 1. Ensure that the computer air vents are not blocked and the processor cooling fan is running. 2. Open the access panel, press the power button, and see if the processor fan (or other system fan) spins. If the fan does not spin, make sure the fan cable is plugged onto the system board header. 3. If fan a plugged in and not spinning, replace it. Solving power problems 69

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System does not power on and the LEDs on the front of the computer are not flashing.
Cause
Solution
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 white then:
1.
Check that the unit is plugged into a working AC outlet.
2.
Open the access panel and check that the power button cable
is properly connected to the system board.
3.
Check that the 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 assembly.
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.
Power supply shuts down intermittently.
Cause
Solution
If equipped with a voltage selector, 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.
Replace the power supply.
Computer powered off automatically and the Power LED flashes red two times, once every second, followed by a two second pause, and
the computer beeps two times. (Beeps stop after fifth iteration but LEDs continue flashing.) Computer powered off automatically and
the Power LED flashes red four times and then white two times.
Cause
Solution
Processor thermal protection activated:
A fan may be blocked or not turning.
OR
The heat sink is not properly attached to the processor.
1.
Ensure that the computer air vents are not blocked and
the processor cooling fan is running.
2.
Open the access panel, press the power button, and see if
the processor fan (or other system fan) spins. If the fan does
not spin, make sure the fan cable is plugged onto the system
board header.
3.
If fan a plugged in and not spinning, replace it.
Solving power problems
69