Why won't my MBP turn on?!

[Patriks7]

Hey guys.
I just ran into a very serious problem. I left my MBP turned on while I went to the gym cause it was installing apps onto my iPhone. When I came back, the MBP was turned off and no matter what I pressed, it would not turn on. Right now I'm letting the battery charge to 100%, but I doubt that would help. Any ideas on what I can do?

 

[qpid]

http://support.apple.com/kb/HT1411

 

[Afterthecalm]

This is not a sarcastic answer, due to it happening to me one time.

Is the screen brightness all the way down?

 

[Patriks7]

This is not a sarcastic answer, due to it happening to me one time.

Is the screen brightness all the way down?

No, definitely not. I left the fan on max since it's pretty warm here, and I couldn't hear it at all.

BUT magically after I finished eating, I came back inside and my MBP was back on again! I guess the battery had to be completely drained...