Well the keyboard and touch screen could still be working, just the display isn't so you can't see what it would be doing. If that is the case, sounds like a GPU problem. Maybe overheating or going bad. Try monitoring the system temps and see if the GPU is actually overheating. If not, then you may want to have it looked at to see if it needs replacing.
Hi, I used gpuz and both the cpu and gpu keep jumping between 40 and 70 and occasionally going to 90+.