I bought my iMac 5 days ago. I'm very experienced with macs and computers in general, but so far this one has had a strange screen problem, and freezing up problems. I am a photographer and use aperture and photoshop, and at least once a day, the computer has frozen completely during one of those programs and required a restart. So, today I walked in after the computer had been asleep for the afternoon, and when I woke it up from the sleep, I got this--- and I couldn't do anything but restart. I'm very disappointed, I feel like I should just take it back. Any suggestions as to what caused this weird screen? I paid so much money for this computer and already it's having problems. Please help! Any advice is appreciated. this is a full screen, the close up of the left, and close up of right. (and the rolling beach ball in the middle of the screen, that changed to the arrow shortly, but still wouldn't allow me to restart. I had no images or programs working when it did this.