I have a 17" 2.4ghz MBP 1920px 256mb M8600 2GBram My MBP crashed while playing Diablo 2 (probably from overheating, I had been playing a little over an hour) a few days after the 10.5.5 update. Now when I turn it on I get up to the apple logo with the spinning wheel over it, and then all these "artifact" thingies you get from a broken GPU come slowly rolling down the screen, with the turn off your mac message. This happens everytime I try to turn on the computer (I've reset PMU and PRAM countless times, and when I try doing a safe boot (holding down shift) the computer stays indefinitely on the apple logo screen getting hotter and hotter); except twice when it actually booted into the OS (once was when I was showing it to the apple store guy, to him it looked like my comp had no probs at that stage) If I get into the OS then I can restart etc as many times as I want as if it is normal. However, while I was on I was trying to back up some of my files when it overheated and crashed again. Since the MBP works on occasion, I suspect that the problem may not just be a GPU thing, but also a software thing. I'm waiting for it to come to a working state again to back up all my data before I can do a clean install of the OS. If this fails I am told that I need to change my logic board, which is priced to make the apple one care thing I did not buy look like a bargain (I'm 3 months out of warranty). Just so you know, the ram is connected to the computer correctly. Do any of you know what the best course of action would be? How can I make my computer start somehow without encountering the GPU crash so I can get into the OSX, or some sort of consol to get the computer to speed up its fans, lower dependence on GPU, or reinstall everything from the DVD that came with it. If all of these fail I wonder if I can take the case up with the department of fair trading (here in Australia); a few computer engineers etc have told me that GPU failures (and you would have heard of Nvidia's M8600s overheating) are classified as manufacturing faults and should be free of charge to replace. I may write to apple first though.. Thanks in advance to your replies.