24" iMac buzzing in Sleep

I've been using Macs for roughly 10 years now but just recently bought my own. I purchased a 24" iMac and had no problems. I always put the computer to "sleep" when I know I won't be using it for a while. Now every, 5 minutes (give or take) I hear a loud buzzing sound that lasts for about 1-2 seconds. I never noticed this until after I installed Snow Leopard. Does anyone know what this is? It's driving me nuts and I've tried to wait and listen for it but I've realized it only happens during the computer's sleep mode. Any thoughts/ideas? Its not doing anything else abnormal but the sound doesn't seem right to me.

Hi
If you have Disk Warrior, then use it to check the state of the HD directory. Directory errors can trigger oddities in the system. If you don't have it, open Disk Utility in your Utilities folder and "verify disk", seeing if any errors appear. DU is nowhere as advanced as DW; hence, errors may be present beyond the capacity of DU to detect or repair them.
If errors do appear via DU, start-up your computer from your Installer DVD. When fully booted, go to the Utilities menu, select Disk Utility and "repair disk". Rerun until you get a clean pass. Then restart the computer and try the sleep mode again.
Genius Bar visit either will lead to an Archive and Install of the OS, or perhaps a hardware repair (I think A & I).
Regardless, post back when you learn something more definitive.

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