Yes, I can confirm that it is the Hard Drive. We had a iMac Bondi 350mhz. The hard drive was a 6gb or something like that, the thing sounded exactly how you describe. We went out, got a nice 60GB one, and all was well. You better backup anything you have, and get a new HD fast. Ya know why? My dad happened to give me that Hard Drive to put in my *giggle* 8100/110. It worked, for a week. So, I am comfirming that it's the hard drive and that you're the luckiest SOB alive. Good luck.