IMac from 2009. Suddenly making noise like a loud fan.

My IMac from 2009 is suddenly making noise like a very loud fan, or a little like a vacuum cleaner. The sound seems to becoming from the IMac, not my speakers. Could this be from any of the wires or connections plugged into it? Restarting the computer did not stop this. I think this happened once before a long time ago. Anything I can do?

Before I saw Mike Sombrio's post:
I restarted the IMac without unplugging the power cord, but the noise was still there when the IMac came back on. Then I repeated this about 10 minutes later, (restarting the computer without unplugging the power cord). This time the noise was no longer there. I don't know what's going on. I hope this problem does not return. Any explanations? Is this a sign that my IMac is having serious problems? Any advice?

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<Email Edited by Host>

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Hello,
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I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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Hi,
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Like my post? Click Kudos (thumb+) to show appreciation.

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IMac from 2009. Suddenly making noise like a loud fan.

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