My Mac book turns on but nothing is happening I hear the noise it makes I can see the apple symbol on the screen and theres a little circle on the bottom that keeps going in circle but I don't see anything else

I hav e a Mac Book Pro it turns on and I can see the apple symbol on the screen  and their is a little circle on the bottom that keeps going in circles but nothing else is happening I can't see any programs or anything on the screen.  I press the buttons on the keyboard but nothing is responding what can I do?

Greetings Jonathan,
Follow this article step by step.  It is very comprehensive and covers this behavior: http://support.apple.com/kb/TS2570
Hope that helps!

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