Solving Power Problems
Common causes and solutions for power problems are listed in the following table.
Table
Power supply shuts down intermittently.
Cause | Solution |
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|
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). |
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|
|
Power supply will not turn on because of internal power | Replace the power supply. |
supply fault. |
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|
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 | ||
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| |
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. | |
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| |
258 Chapter 10 Troubleshooting Without Diagnostics