Macbook won't turn back on--help!

I was working on my macbook this evening and all of a sudden it just turned off without warning. It is fully charged and plugged in, and now it will not turn back on! There was a cd in the drive. I do not know what could have happened or what I could have done. Has the computer crashed without warning? Is there some troubleshooting that I can do to get it to turn on again? Has this happened to any other macbook users? I have not had any other problems with my macbook. It is just 3 years old as of a month ago.
Any help on this would be so appreciated!! Thank you!

More options here...
http://support.apple.com/kb/ts1365
...might have to take it in...

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