These are some symptoms that may be caused by the power supply. Other components may also cause these same symptoms, check the general diagnosis page for more information.
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Symptom
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CheckClick on underlined items for further information
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It makes a squealing or other loud noise
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- The power supply fan is failing and needs replacement. In most cases, the entire power supply must be replaced.
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Nothing happens when I turn on the PC
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- Check that it is securely plugged into the outlet and into the back of the PC.
- Check that the outlet has power.
- Check for a second power switch near the power supply.
- The main power switch has failed and needs to be replaced.
- The power supply has failed and needs to be replaced.
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The PC freezes before the operating system starts loading
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- If the power supply does not supply the proper, stable voltages to the various components it may prevent the PC from starting. The voltages can be tested with a multimeter.
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The PC randomly shuts itself off
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- The power supply could be overheating, check that the fan is working.
- The power supply could be failing.
- See also your BIOS and Control Panel power settings.
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