So constant GPU failures are driving me insane. This will be the third time my GPU failed in someway or another. First time it failed was 2 weeks after I purchased my Macbook Pro back in the summer of 2007, the second time is when the screen would not power up even with an external monitor connected and now is a repeat of the second failure. Anyone have any problems where their MBP's screen would not power on even with an external monitor connected? I can hear the sounds of the computer working fine just the screen won't power up.