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2007 17", it may be the dreaded Nvidia high lead solder ball issue.  That was around the time Nvidia used 90% lead in the solder balls on the video chips.  Those are the solder balls between the chip and the substrate, not between the substrate and the PCB.

On several occasions I have heated the die to about 300 ºC for 60 seconds or so.  It would then work again, but only for a few months at best.

Just one idea