my computer is "on" as the green light on "caps lock" is one but the screen is black.
my MacBook_Air has a black_screen while power is on. What is the problem? How do I correct this?
MacBook Air, OS X Mountain Lion (10.8)
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
If this does not help, contact Apple.
http://support.apple.com/kb/TS1365
Best.