I gave up trying to save them ;-{
The best solution is getting to a better GPU! Luckliy you have an out. Apple carried the 2011 design to the 2012 model. All you need to do is get a new logic board:
- 661-6491 - Logic Board 2.3 GHz i7
- 661-6492 - Logic Board 2.6 GHz i7
They are running around $500 USD recycled.
The only thing you need to do is a slight modification to the 2011 displays LVDS cable using a nail file as described here:
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
0