Mac book pro will not start up.  Charging light is on, but no response from computer.  What happened?

The Mac Book Pro was fine, and then just stopped working.  I connect the power source, and the light is on as if it is charging.  However, when I try to turn the laptop on, nothing happens.  There is no response whatsoever.  Any ideas what happened and what I need to do?

Examine this support article for possible solutions:
http://support.apple.com/kb/TS1367?viewlocale=en_US
If no success, a trip to an Apple store genius bar is the best recourse.
Ciao.

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