My iMac making rattling sounds. Is there any solution?

My iMac (Intel Core 2 Duo, 2.66 GHz) started rattling noise even at the low temperature. It started suddenly and I tried SMS reset, installing fan controller etc but it does not work. It sounds like shaking a spray paint can before using. It is quite annoying and more than anything else eating out my affection for Mac. Please help me out!!

Here’s a site that plays HD problem sounds: http://datacent.com/harddrivesounds.php

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