Solving Power Problems

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

Table D-2Solving Power Problems

Power supply shuts down intermittently.

Cause

Solution

 

 

If equipped with a voltage selector, voltage selector switch

Select the proper AC voltage using the 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

Replace the power supply.

supply fault.

 

 

 

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.)

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 the access panel, press the power button, and

OR

 

see if the processor fan (or other system fan) spins. If

The heat sink is not properly attached to the processor.

 

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 151

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HP C7A35UT#ABA, D3K31UTABA manual Table D-2Solving Power Problems, Power supply shuts down intermittently Cause Solution
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