Overheated MBP now hangs at boot...

Friend of mine gave me a spare battery for my MBP which I recently fitted. I noticed the machine became hot during running with this fitted but thought nothing of it. After a long day at the office and my machine left alone I noticed the screen image corrupted and the machine so very hot. I shut it down, let it cool and tried to reboot. Now it has the gray screen with the timer and chimes. But the gray screen has vertical banding that looks like badly formed or corrupt tiles of graphical data. It lasts about a minute and the timer stops. That is as far as it gets. I can see it charges and I can also do a command-T and run the MBP as a hard drive and get all the data off no problem.

This is a mint, but old machine that I've hardly used, is it worth replacing the logic board, or even is it the logic board. I tried the external monitor and this doesn't register either.

Any thoughts??

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Please give is the last three figures of the serial number (battery compartment)

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Last three digits are YKO and it is an A1260 model (2.5 GHz)

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Apple MacBook Pro "Core 2 Duo" 2.6 15" (08) Specs

Identifiers: Early 2008 - BTO/CTO - MacBookPro4,1 - A1260 - 2198

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My first thought on this is that your Nvidia 8600 GPU has failed. Apple is replacing the logic boards on these machines for free for up to and sometimes beyond four years from the date of purchase. Your machine should still be covered but I would call Apple now. You can reach Apple here: http://support.apple.com/kb/HE57

In the USA turn around time is four days. Apple will FedEx you a box and pay for everything. There was a class action law suit on this GPU but it has ended now.

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totally missed this support issue. Contacted apple and they are looking into it for me, most likely free of charge - thanks for the help!

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rodsampson will be eternally grateful.
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