I was away from my new iMac on Monday and when I came home it was off! I thought that was strange but tried to restart. Wouldn't do anything - then I got the gray screen with Apple and what looked like the firmware upgrade bar. I waited and nothing happened! Finally got it to boot from system disk and verified the drive. Got an error message that in essence said drive couldn't be repaired. Tried to repair 3 or 4 times and nothing. So, I reformatted and restored from TM. All is fine now (24 hours later) and disk verifies with no errors. My question is that this computer hit the 30 day return on May 27 and this happened on May 30! I called AppleCare yesterday to have a record of the problem! The guy was surprised I fixed it myself. Can I trust this drive? Should I carry this heavy computer to the Apple Store and try to get a replacement? Thoughts? I've never had this type of drive problem after 30 days and then all is recovered. Yes, I have 3-year AppleCare.