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?

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.

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