check for mandatory new motherboard if 8600 or 9600 GPU
well, the nVidia GPUs from that era were faulty due to a mismatch in the engineering materials that were used to build the actual chips. check out
theinquirer.net the bump underfill had wrong characteristics - so the GPU chip soldering all fail given enough time & heat, thats on MBPs and Dells & HPs...
Some chips to avoid are nVidia MCP79/9400M chipset, and the nVidia G96/9600M GT GPU.
http://s.tt/14bU3
This Apple knowledge base article mentions also the older hotter nVidia 8600
http://support.apple.com/kb/TS2377?viewlocale=en_US&locale=en_US
however I think it can best be summed up by this apple technician who has repaired many MBPs for this issue:
"MacInTouch Reader
I've performed over 400 of these nVidia repairs. It is the entire logicboard that is replaced. The replacement is a reworked board (reconditioned with replaced chip or seating process). The area around the PCB and GPU shows discoloring likely from the re-heat process.
Of these repairs, only 4 have been repeats (needing a 2nd board after +6 months).
Apple has never had an extension this long, so I expect it is that the MBP is seeing some longevity. However, don't expect it to last. I would have loved to been the fly on the wall when nVidia and Apple met to discuss the re-imbursement terms for these repairs. The logistics for parts, outsourcing of PCB/surface mount repairs, testing and depot/repair labor. And don't forget the consumer's lost time/costs.
One thing though, once the extension program is up, I wouldn't touch a used 15" MBP ever.
One should check the battery bay for the new MAC address to see if the board has been replaced. If not, walk away and consider something newer."
(from
http://www.macintouch.com/readerreports/macbookpro/topic3863-007.html)