Don't you only get Apple Care for the first 90 days? I've had my Mac for closer to 120 days I'm afraid. I posted this problem on the Apple forums and emailed a friend of mine who works at an Apple store. So we'll see what happens. If I had to guess, I'd say it's a problem with the ATI graphics card, but this is different from the problem I've read other people are having with the ATI card.