My MacBook pro will not turn on after connecting to an external display

I connected my MacBook pro to a projector for a presentation using a VGA adapter. It worked for a couple of minutes, then my computer shut off and I can not turn it back on. It has never given any trouble before then. Now when I try to turn it on, the white led comes on briefly, then it makes a tone and nothing happens, the screen stays dark, any idea what is wrong????

Probably  option, command, P, and R to reset the pram. Article at link.
http://support.apple.com/kb/ht1379

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