black screen on MacBook Pro
my Macbook Pro wakes up from sleep but there is a black screen. It is useable only after tethering to an external monitor in mirror mode. I can see a very faint image on the screen but changing brightness does nothing. It will not show safe mode options when restarted while holding down the power button. It seems everything is functioning except the screen.
MacBook Pro 15″, OS X 10.10