I read all the forums about the faulty iMacs, but eventually made the decision to buy a 27", 2tb, 16gb ram in good faith thinking that the problems were in the past. After just two weeks the machine won't boot up. I've tried everything but none of the keyboard commands before boot even work. After waiting so long, I'm really disappointed. I think I will ask for a refund as this machine cost £3000 and I don't want to be having to take it in for repair in 6 months time. With any luck Apple will have released the new Mac Pros by the time I get my money back and I'll buy one of those instead. I like a lot of Apple's products but I will never again say "It just works" because unfortunately it's just not true.