IMac clicking when starting up or waking up

I recently replaced my internal hard drive in my 20" iMac and it worked beautifully for about a week. Then, suddenly it started making a horrible clicking noise upon startup or when waking up from sleep. It goes on for about 10 minutes and then eventually tapers off and quiets down. But it happens every time I start up the computer or when I wake it up after it's been asleep for a while. I don't seem to be having any other problems with the functionality of the computer. Everything is accessible and working OK on the computer. I am just worried because many years back when I had a PC the internal hard drive failed after I heard a similar clicking noise, although it's been going on for a few weeks on my Mac without worsening, and my PC hard drive failed within a couple of days of the start of the clicking.
Is it possible that this is a fan or some other internal mechanism that possibly got jarred or moved slightly when I replaced the hard drive? Or a bad hard drive? I don't really want to open up the computer all over again but at this point, I suppose I have to. I am just not sure what to look for when I do. Anyone with simmilar experience or any advice about a plan of attack, please let me know. Thanks!!
Also, here is a link to the sound that it makes. You might have to turn it up a little bit to hear it well.
https://www.dropbox.com/s/bdnmh5fvbuocew7/2012-05-12%201026.wav

I ended up opening up my iMac again because I suspected that the problem was a cable that had not been tucked back in properly when I replaced the hard drive, and was flapping against one of the fans. Before I opened it up, I put my ear against the back of the machine to see if I could pinpoint generally where the noise was coming from. Once I opened it back up again, I saw the cables that must have been the cause of the noise. I pushed them back into their housing a little more securely, closed up the machine again, and hoped for the best. Sure enough, it solved the problem! It's been a few weeks now since I did this and the clicking noise has not returned.
If your machine is brand new, you should be able to have the geniuses at the Apple store fix the problem, I would assume. I don't know if your problem is the same as mine, since I'm quite sure it was a user error when I replaced the hard drive, but if you haven't been messing around with the inside of your machine, it may not be the same thing. Good luck!

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<Email Edited by Host>

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IMac clicking when starting up or waking up

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