MacBook Air won't turn on when connected to power adapter.

When the power adapter is disconnected and my MacBook Air runs on battery, it turns on normally. Any idea what might be wrong. I've tried all kinds of different system resets but no luck. Thanks

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".

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    Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
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