Macbook pro - was doing my work and black screen appeared, shut down, and won't turn back on

i was doing my work, plugged a usb in the port, and then my screen went black and turned itself off.
i used my power plug on a different mac and it still worked, but when i plugged it into my macbook pro the green like flashes once and then dissappears.
the macbook will not turn on at all.
does anyone know whats wrong with it?
thanks

See if a SMC reset will restore life in the MBP:
http://support.apple.com/kb/ht3964
If not, make an appointment at an Apple store genius bar.
Ciao.

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