If that's the same issue I had, it was a defective nvidia chip. I went through 2 logicboards and I know several of my friends who had 2012 MBPs went through a

If that's the same issue I had, it was a defective nvidia chip. I went through 2 logicboards and I know several of my friends who had 2012 MBPs went through a few too. We used to be an Apple shop, and we had a lot come in due to that issue.