Alrite so let me explain to you how this screen came about. First off, I own a 27-inch iMac. I was online, reading some news, then after a bit of that, I went to watch a movie, like I have done countless times before with no such incident. 5-10 seconds into the video clip, the computer went dead. Not fans running, nothing. Dead. Dead. Dear. I pressed the restart button, and it turned on like it was fine. Got the light grey screen, with the small apple logo in the center. Then a few moments later, a darker grey transition folded down from the top and i was prompted with this error message. I have no CLUE what-so-ever what it means. Ive tried a few times to restart and the same thing. Ive left it unplugged for 30 minutes to make sure there was no residual energy floating around, and same thing. ANY HELP WOULD BE APPRECIATED. I called Tech Support (1800myapple) and since my 90 day phone service is up and over with, I still have 140 more days for the hardware, but the guy thinks it's a software issue. Also, I haven't installed, downloaded, uninstalled anything worth mentioning that would of caused this error. I've very computer savvy, more so than most, but Im not a die-hard computer nut... but I do have a great understanding of whats going on... but im at a lose for words.