The screen stays black, I do not know what cause it?

My Macbook in the last 3 days when I turn on by power button or restart the screen stays black. If I get lucky by using cmd+ option+ shift+ power button it comes up. Any suggestion what is going on? If it's on I have not problems using my computer.

http://www.ifixit.com/Answers/View/54820/What+is+the+lock+symbol+with+a+circle-a rrow+around+it

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