Unknown iMac High Pitched Noise

Hey,
My Grandma got an iMac (Intel C2D) and today it makes a high pitched noise. I am unsure where the noise is coming from in the machine.The noise happens all the time, and it even happens when it is off?
Is there something like a software update for this? or should we send it in for service?
Thanks,
- Devon Merner

Since you noted that the noise is present even when the Mac is off, it's probably emitted by the transformer in the power supply unit. It should be considered a hardware defect, though not a serious one but can still be annoying, it happens sometimes on electronics.
You can try reset SMU by shutting down the Mac, disconnect all cables and wait for at least 15 seconds, then reconnect cables and start. (http://docs.info.apple.com/article.html?artnum=303446)
And you can also try reset PRAM, though I doubt it's going to do anything, see
http://docs.info.apple.com/article.html?artnum=2238
if these doesn't work, you should call Applecare and make your case, if you can clearly reproduce the problem you shouldn't have a lot of trouble getting it serviced.

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