Screen and keys not lighting up when switched on and has black screen as though its in sleep mode

I have tried switching on my mac book air, it starts up but it docent light up and screen stays black as though its on sleep mode, is their anything i can do.......

Reset PRAM.   http://support.apple.com/kb/PH18761
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".
Best.

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