Macbook won't shut down or restart. it freezes at the blue screen.

first time this happened i didn't notice. But then everytime I shutdown my macbook it freezes at the blue screen until all the battery is dranged, so I have to shut it down by pressing the button. Then I tried to restart it and the same thing happened!
I don't remember downloading any new apps that night that might have caused this.
please help.
Mac OS X 10.6.7

Hi. Try these steps.
http://support.apple.com/kb/ts1545
Good luck!

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Macbook won't shut down or restart. it freezes at the blue screen.

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