Entire MBP screen becomes pixelated!

This has happened to me three times already. I usually close my MBP when I'm not using it, but recently, when I open it again, my screen is all pixelated. I try to press buttons and move the mouse but nothing happens and I have to do a hard restart. I don't think it's a hard drive problem because when I restart, there are no problems. But the screen thing is really annoying because I have lost work.
I should note that twice it has happened while running photoshop cs, so I don't know if that has anything to do with it.
Any help would be appreciated.

I had a failing GPU, they replaced it, and then I also experienced wake up problems.
Do you see the same pixelated screen as I do? :
!http://www.nieuwegiessen.nl/images/corrupt.jpg!
Check the following post for more info, your profile preferences might be corrupted:
http://discussions.apple.com/thread.jspa?threadID=1660846&tstart=0

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