I have a problem with my macbook after i pressed the power button the screen turns blue and nothing is happening with it! What can I do? Pls helps and thx btw

I have a problem with my MacBook Pro, I pressed the power button and after that the apple noise came and the screen turned blue. What can I do and what happened? pls help & thx btw

You may find this helpful:
http://support.apple.com/kb/PH14061
Ciao.

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