21.5" iMac whistles whenever a file is moved and after a while in use makes loud continuous crackling noise

I have just received a refurbished iMac 21.5" running Mountail Lion but build mid 2011. It emits a high pitched whistling noise similar to a smoke alarm but not quite as loud whenever a file is moved, eg. to the trash and then while sorting old files recovered from the hard drive of my now deceased macbook, it began to make a crackling noise as well. Does anyone else have experience with this behaviour? It continues while the work continues and then when I stop moving files it continues for maybe another ten seconds then stops.

I'm afraid I don't have a solution, but I'd recommend you call AppleCare as you have 90 phone support (3 years if you bought the extended AppleCare). Hopefully they'll have a clue as to what's causing it or organise getting it fixed.
Before making the call there are a couple of things you could try. I doubt they'll work but you never know. They won't do any harm and will take a couple of minutes. An SMC and a PRAM reset. If you still have the problem best make that call. Good luck.
https://discussions.apple.com/docs/DOC-3603

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