Ok first some background: Late 2011 2.2GHz Intel Core i7 8GB RAM Mountain Lion 10.8.2 This has happened to me a few times now (3-5) since I bought the computer in late June. I upgraded the RAM from the standard 4GB to 8GB of Samsung RAM. Also Upgraded to ML when it was released. I can't remember for sure but I think I have had the issue that I am currently having before any of the upgrades so I cant really say my problem started happening after I upgraded the machine. But I really can't remember :/ Would RAM even be able to do something like this? But anyway... So the problem... As you can see there are all these little colorful pixelated dots on the screen. The computer will totally freeze up and I am not able to click on anything and even the little blinking dots on my clock stop blinking...however I am still able to move the mouse arrow around the screen. It seems like it has happened about once a month since I have had the computer. The computer pretty much always stays on and does not sleep since I have it hooked up to an external monitor (yes I get the pixleation on both screens) and I also use it to power the Internet on my Xbox via ethernet port. So when it has happened in the past I usually turn on the external monitor and am greeted with what you see in the pictures. However today everything was fine and dandy and I restarted to install some updates and right off the bat those little dots were covering the screen and I took the pictures that you see above. Im sorry for the length of this post but I wanted to try to get everything out on the table all at once. So what are some ideas? I was thinking it is a GPU issue but i wanted to get some ideas before I take it into Apple. If this has been discussed before I apologize. I did search a month or so ago when it happened last but I never found anything that really matched my problem.