Reporting in with a late 2009 MacBook with a 9400M. I was playing StarCraft II tonight and at the end of a game I was on the score screen and my screen started flashing it's normal contents and black, except in horizontal chunks. They were thicker at the bottom and thinner at the top. I saw that my CPU was running rather hot (around 70 Celsius) but I've hit 85+ several times. Does this sound like a failing GPU, or just a freak bug?