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When I leave my desktop computer off for a period of time and then turn it on, the fan is very loud (in a way that makes me think something is wrong).

Oddly, if I shut down my computer and then immediately turn it back on again, the fan is quiet and docile. If I only restart the computer (not shut down then press the power button to turn it on) the fan stays very loud.

This problem began less than a week ago - should I be opening up my comp. tower to have a look at the fan? I have no idea why shutting down and turning on again solves it.

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marked as duplicate by Karan, Shekhar, Ярослав Рахматуллин, Darth Android, Excellll Jul 18 '13 at 16:38

This question was marked as an exact duplicate of an existing question.

The loudness would probably depend on the fan speed, which might be different in those two situations. In any case it really doesn't matter. If it's making a loud noise it means its bearings are worn out. You can try opening it up and oiling it, but the best solution would be to simply replace it with a matching one (fans aren't that costly anyway). – Karan Jul 15 '13 at 3:11
Not really a duplicate as that fan always had the problem, whereas this one can be fixed by turning off and turning on. Nevertheless, sounds like I need to replace the fan – nebffa Jul 15 '13 at 5:56

One can only guess, but it sure sounds as if it is failing. I would replace that fan. If @Karan will change his response to an answer I am glad to delete mine.

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