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How To Diagnose Fan Problems

These are some symptoms that may be caused by the cooling fans. Other components may also cause these same symptoms, check the general diagnosis page for more information.

Symptom

Check
Click on underlined items for further information

It makes a squealing or other loud noise

  • The power supply fan is failing and needs replacement. In most cases, the entire power supply must be replaced.

  • The CPU fan is failing and needs replacement.

  • Another cooling fan, such as a case, drive or auxiliary fan is failing and needs replacement.

The fan is slow or does not spin at all

  • The power supply fan is failing and needs replacement. In most cases, the entire power supply must be replaced.

  • The CPU fan is failing and needs replacement.

  • Another cooling fan, such as a case, drive or auxiliary fan is failing and needs replacement.

  • Any of the fans listed above are dirty and need to be cleaned.

The PC freezes or shuts itself off unexpectedly

  • The system may be overheating because of inadequate cooling. Check that all cooling fans are clean and working properly.




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