2.8GHz 24" iMac Making Weird Noises

It started out sounding exactly like a cricket. When I first heard it, that's what I thought it was. It would start soft and grow louder, then softer again and fade out. Now the sound has the same pattern, but it's evolved into a full-fledged rattle/clicking sound and has a cyclical pulse to it. Hard to explain. It's fairly loud and VERY annoying. It happens every minute or two and lasts for about 20 seconds. Any ideas?
This is my 2nd Mac w/ problems immediately or very soon afterward...2 out of 2. Just lucky I guess, right?

Does the system run normally? Open up Disk Utility, select your drive on the left and look at the info listed at the bottom for SMART status. Also Verify the Disk.
It could be one of the fans making the noise. Possible rubbing up against something else inside. Either way you'll have to put a call in to Apple support to have it repaired.
George

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