Model A1311 / Mid 2011 / 2.5 & 2.7 GHz Core i5 or 2.8 GHz Core i7 Processor

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Very loud rattling noise

Within a few minutes of turning on my iMac 21.5 EMC 2428, I hear a very loud and distracting rattling noise. It sounds like the noise is most pronounced from the right bottom speaker. I'm trying to diagnose an fix it. Any guidance? Thanks


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I would suspect a failing fan. There's just not much that moves in there. Could be a wire in the fans path.

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Mimi will be eternally grateful.
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