Solving Power Problems

Common causes and solutions for power problems are listed in the following table.

Table C-2Solving 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

Contact an authorized service provider to replace the power

supply fault.

supply.

 

 

 

Computer powered off automatically.

 

 

 

 

Cause

Solution

 

 

 

Processor thermal protection activated:

1.

Ensure that the computer air vents are not blocked and

A fan may be blocked or not turning.

 

the processor cooling fan is running.

2.

Open hood, press power button, and see if the

OR

 

processor fan spins. If the processor fan is not spinning,

The heatsink is not properly attached to the processor.

 

make sure the fan's cable is plugged onto the system

 

board header.

 

3.

If fan is plugged in, but is not spinning, then replace the

 

 

heatsink/fan assembly.

 

4.

Contact an authorized reseller or service provider.

 

 

 

Power failure (power supply is overloaded).

1.

Check that the voltage selector, located on the rear of

 

 

the power supply (some models), is set to the

 

 

appropriate voltage. Proper voltage setting depends on

 

 

your region.

 

2.

Open the hood and ensure the power supply cable is

 

 

seated into the connector on the system board.

 

3.

Check if a device is causing the problem by removing

 

 

ALL attached devices (such as hard drives or optical

 

 

drives, and expansion cards). Power on the system. If

 

 

the system enters the POST, then power off and

 

 

replace one device at a time and repeat this procedure

 

 

until failure occurs. Replace the device that is causing

 

 

the failure. Continue adding devices one at a time to

 

 

ensure all devices are functioning properly.

 

4.

Replace the power supply.

 

5.

Replace the system board.

 

 

 

Solving Power Problems 147

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HP 3080 Table C-2Solving Power Problems, Power supply shuts down intermittently, Computer powered off automatically
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