Oh my God oh my God oh my God... Full screen: Close-up: All I was doing at the time this happened was scrolling through Google Image searches for an article I'm writing. Had multiple applications open including Chrome, FireFox, InDesign, TextEdit, and Excel, all of which my computer has handled just fine before. It was like this for a while, then I was able to put it into sleep mode and when it woke up, it was fine. Shortly after that, however, the screen went completely blank and was replaced by little white tiles that I couldn't take a clear picture of. Computer was completely unresponsive, managed to shut it down by holding power button, it is turned off now but I am frightened for my workhorse computer right now. Specs: 2011 27" iMac i7 Intel 3.4 GHz Radeon HD 6970M w/ 2GB of Video RAM 12 GB RAM 1 TB HDD I DID have AppleCare on this baby and she DID have some corruption in the screen a while back, but that was all taken care of and covered by AppleCare in early 2013. AppleCare expired in May of this year. I just installed a big firmware/software update on the machine (through the App Store and everything legitimately) two days ago and maybe that is the reason why I'm having problems right now, but I'm not sure. Please, tell me there's an easy fix for this and/or it will be better soon. Really frightened right now because this is my workhorse computer and I cannot afford to loose it now.