I have an original Wii that, when it has been on for an hour or so, the screen goes a faded green, although I can still see the game. I think it might be the GPU and would like to replace it. However, I do not know how to choose a current GPU that is on the market and suitable for this job. The whole unit still works and so it would be a shame to throw it out. I would be grateful for any suggestions. This will be my first attempt at this sort of repair.