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If a CPU makes unusual sounds, it is best to close all programs and shut off the computer.

If it is a fan problem, cleaning it with canned air may dislodge the problem.

HOWEVER, a hard drive that is going bad can also cause a bad grinding noise. The harddrive could fail. So, back up your files, but only turn on the PC until the sound begins and then quickly turn it back off, let it cool for 10-30 minutes and retry.

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13y ago

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