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If this have been happening all so many times. Its rather serious. Maybe the next MBP revision would see an improvement in this area hopefully
 
snip ... I asked her if the new motherboard has the same defective GPU, she was not able to answer.

Is ther any way to find out if the new motherboard has a defective-free GPU? I heard that some video problems could be fixed with the 10.5.5 update. How about this GPU problem? I am trying to decide whether to keep the laptop or sell it. Thanks.

I don't think there is a way to determine this. Primarily, since no one has announced what versions or dates are impacted by the problem.

Selling is an option. Plenty of people are NOT having a problem and resale values are still relatively high.

Cheers,
 
its' not a GPU issue. its a logic board issue.

the other day i was working on a first generation (ATI X1600) mbp with the same exact problem. But this one would boot once out of every 10 restarts, and sometimes freeze at the desktop. The rest of the times it would just stay at a black screen with a solid LED, hard drive and fans running, but you can tell it wasn't doing a thing (caps lock LED not responsive). It was a vegetable.

swapped out RAM, RAM slots, SMC reset, etc. nothing worked. didn't seem like it wanted to do a firmware restoration, or update the firmware (when i got it to boot).
 
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