Last Friday, I returned to my 24" 2.8ghz Intel iMac and found it had frozen. Rebooting it caused a folder with a question mark to pop up. After reading up a bit, I ran Disk Utility off of the Mac OSX disc and it didn't find any problems. Restart and it was just fine. Yesterday, same problem happened when I booted it up. Did the hardware test (which I'm not sure even covers the hard drive) and found nothing. Rebooted a few times and I got in. It did crash again (beach ball spins, mouse moves, but nothing else happens). I suspected at the time it was a heat issue, so I installed an app to keep the fans running. Machine was a stable 41 degrees C. Today, same thing happens (folder with question mark). I do the usual steps, even reset the PRAM and nothing. Disk Utility doesn't even see the hard drive. Almost as if it's not connected. Before I take the machine in, is there anything I've missed? I believe my iMac is out of warranty. I do need the data on the hard drive. If it was a PC, I would go in and check the drive connectors or even remove the drive to put into an enclosure, but with the iMac, it's not possible. Thoughts?