Has anyone with a rev a 1.8 G5 iMac had early drive failure problems? I purchased this iMac for my wife back in february. About 2 and a half months later the 250gig drive failed. It was replaced. Now another 2 and a half months later it has failed again. It is waiting on repair at the apple store, but the expected service is replacing the hard drive. I realize quality may not be what it was in drive technology, but before this I've only lost 1 hard drive in my entire career. I'm guessing it could be power issues causing early drive deaths, but the machine has no other symptoms. The first drive failure was after it had been turned off for a week while we were away. The second drive failure was after it locked up. On the reboot both times it came up with the folder/question mark icon unable to find the OS. This system is on APC UPS power. Any thoughts? Anyone else had drive issues?