My macbook pro is stuck... Help!!!

My macbook pro restarted when i was updating to the lastest ios but after it reopened, it is froze on a screen with i think are codes... And i tried pressing buttons on keyboard but nothing happens... What shud i do?

Reset PRAM. 
http://support.apple.com/kb/ph11243
If that doesn't help, post more specific details and we'll go from there.
Good luck!

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