I have a 2011 MBP, 2.2 GHz, 8 GB, AMD 6750M, 512GB SSD that I installed myself. No AppleCare. Recently, I have had these weird glitches showing up shortly after I connect an external screen: http://dl.dropboxusercontent.com/u/762778/Photo 2013-04-12 22 11 05.jpg http://dl.dropboxusercontent.com/u/762778/Photo 2013-04-13 12 11 27s.jpg What makes me think that this is a GPU related issue is that it can be forced without any screen attached if I untick the automatic graphics option in OS X: http://dl.dropboxusercontent.com/u/762778/Video 2013-04-13 12 18 07.mov If I leave it on, it works for a while and then glitches, but there have been times where the screen just goes black or some blueish pattern, after which I'm forced to shut it down and restart. It's less noticable on Windows though, but still annoying since I primarily use OS X. I have tried resetting the SMC and PRAM and I recently reinstalled OS X. This is not acceptible for a two year old laptop that I paid a lot for, as a student I don't want to pay for expensive logic board replacements. I will call the Apple Support on Monday. Any advice?