Not a Fan of the Noise

Having often read about other folk's issues with fan noise, I thought they were nuts. However, since I had my logic board replaced a week ago, my iMac sounds like an F-16 reading for take off. Could the new logic board be the culprit? The computer "whines" when under very little CPU load (as reported by Activity Monitor). The noise seems constant.
Yesterday I called tech support and they had me reset some switches inside the computer near the fan, but it didn't help.
Any suggestions??

Barry, I took your advise and they replaced the "new" logic board. The computer is absolutely silent now.
I found it interesting that the guy in the store ran some sort of diagnostic program on the computer (before replacing the logic board) which said everything was OK. Then he tried telling me "some people" are too fussy about hearing the fan. At that point I told him that the computer's too noisy and I wasn't making a 100 mile drive for his companionship. He offered to replace the logic board a second time and that fixed it.

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