Troubleshooting Without Diagnostics
Solving Power Supply Problems
Common causes and solutions for power supply problems are listed in the following table.
Solving Power Supply ProblemsProblem | Cause | Solution |
Power supply shuts down | Voltage selector switch |
intermittently. | 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.
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.
Processor thermal protection activated:
A fan may be blocked or not turning.
OR
The heatsink 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 hood, press power button, and see if the processor fan spins. If the processor fan is not spinning, make sure the fan's cable is plugged onto the system board header. Ensure the fan is fully/properly seated or installed.
3.If fan is plugged in and seated properly, but is not spinning, then replace the processor fan.
4.Reseat processor heatsink and verify that the fan assembly is properly attached.
5.Contact an authorized reseller or service provider.
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