So have your machine diagnosed and if it comes up with a faulty GPU (which it probably will) think about having it reballed to actually fix the problem, rather than having the logic board replaced. The only 'real' solution seems to be having the GPU ' BGA reballed' - which isn't as expensive as a new logic board. Many users report going through 3-4 logic boards and still having the problem. Just be aware that the problem usually just continues to get worse and that a logic board replacement doesn't always 'fix' the problem. I found a used one on EBAY for 250 (it has a 3-month warranty. To find a replacement logic board, look at the bottom of your MacBook Pro to see which model number you have and just search on MacBook Pro your model number here logic board. Really the only thing that you can do is to take your machine into your local Apple Store or AASP and have them diagnose the problem and get an estimate for repair. At this point, I gave up and bought a used logic board. There is a long thread here -> - about problems with the 2011 (mostly, but not always, on the Early 2011 models) about problems with the discrete GPU (which would kick in whenever you launch Chrome). OK, it's likely an Early or Late 2011 model, then.
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