I've been fighting to get my MBP back up and running again. Good news is I have a temporary drive in it and it seems happy. EXCEPT... The display in the clamshell (which I will be replacing anyway) is not coming on- I have to use an external display. It doesn't even seem to be acknowledge by macOS (10.12.2 beta) so I can't even try to force it. I thought perhaps the display had died, but when I was trying to reinstall OS X initially (10.7.6) it came on once, but when I had to reboot, it disappeared again. It works fine with an external display. I've reset the SMC and the PRAM but it didn't matter. I am thinking some wiring, perhaps, has become loose or broken? Any ideas?