Today I started having trouble with me MBP 15", and I think it is the GPU. Sudden restarts, distorted image when restarting and freezing up. After some 5-6 restarts my MBP started normally and I am currently being able to use it. From what I have read, this seems like a GPU failure. Now my doubt is, how successful are repairs for fixing this issue? From some posts here it seems like once the problem starts it will keep happening even after a new GPU is installed by Apple. I would appreciate any positive experiences from people out there. I'm not sure if I should repair and instantly sell my MBP to buy a new one.