My wife's iMac MC508 is 2 weeks old, I had to re-install it after 1 week because Safari kept hanging. It was working ok yesterday lunchtime when I used it but last night my wife switched it on and just got the white screen with logo, then a blank progress bar then the circle thing before it shut itself down. We have tried all the key combinations that we found online but no change. The only thing I have not done is put the install disk back in for fear of not being able to eject it. Has the hard drive packed up? Does this mean a trip to an Apple store? Any ideas anyone? Many thanks in advance.