Just bought an iMac 21.5 inch from Amazon 2 months ago. Easy to setup with lion pre installed. However the hard drive grumbles away in the background even in sleep mode. Didn't notice it at first but it is quite annoying now. Anyone else have this problem
I've had an iMac for a while now and have never had this problem. Occasionally you might hear a noise if you have a disc in the drive, but nothing that seems to match your description. I would describe mine as silent actually so it sounds like that there could be a problem somewhere with yours.