MacBook Pro 2014, NVIDIA 750. For the past fortnight, the screen keeps going black when the battery appears to have sufficient charge. I've tried PRAM and a couple of other button combinations and it turns on only to show the depleted battery symbol. I've tried SMC, and twice running the battery...
Okay, I know this is long, but here goes:
Originally, our problem was a gray screen with lines but showed the Apple symbol and progress bar, which would go about 2/3 and then go to complete gray screen, then black screen, then restart. Apple store said it was the logic board (everything else...