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Just behind the power, the little rectangular 3X1" metal & black box.
It looks damaged on my iMac, while power supply and logic board look clean (and while no led on the l b, but a bzzz on the logic bord when powered on).
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This black box behind the power supply?
http://guide-images.ifixit.net/igi/XARgc...
If so, that is your hard drive.
If that is not the item you are talking about, I'd look through the guides for a picture that shows it well, and link to it in your question if the guide doesn't tell you what it is.
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