I have an early 2011 MBP - 15in with 1GB Graphics card and the high res display. I have experienced the exact problem mentioned in this article, which has rendered the computer almost unusable. It sometimes requires 10 attempts to boot up without failing (in the form of glitchy gray lines). The issue seems to be "rectified" when using gfxCardStatus to force the computer to use integrated graphics only. I'm out of warranty, unfortunately. The Genius Bar offered to replace the logic board, but after reading through the thread mentioned in the article about so many users with the same exact problem, I have been hesitant to go forward with this. You will see, if you look through that Apple Support Communities thread, that many other uses have had this problem recur - if not immediately, then down the road - even after the logic board replacement... and even after multiple replacements.