So, today my machine started to act up again. Window refreshes goes like a slide show, gaming just crashes the machine. So I fired up Apple Hardware test: Test result: Failed Error code: 4VDC/1/40000003: VideoController My first 8600M died within months after i got the MBP, but this one has actually lasted since February 2008. I have also had dark spots on my screen, and got it replaced. Crossing my fingers that Apple is giving me a new one this time, instead of repairing it again. If they had replaced it the first time, they would have gotten away with a new machine, instead of two new logic boards and a screen, which would be a considerably cheaper solution for them, I guess.