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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
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.