Why does my Mac's screen suddenly go black?

Whenever I'm using my Macbook Pro, the screen will sometimes suddenly go black. It does it even if I'm doing different things. It' not hard to get it back on, I just have to click the mouse or press the space key a couple of times, but then the mouse doesn't work for a couple seconds. It's not that I'm not using it (I know that if you don't move the mouse for too long, the screen goes black), there's definitely something wrong with the computer. What should I do? Thanks!!

You can also check your Energy Saver "Display Sleep" options. 
Depending on your model Macbook Pro, this may apply - MacBook Pro (15-inch, Mid 2010): Intermittent black screen or loss of video.  Affected computers were manufactured between April 2010 and February 2011. 
MacBook Pro: Distorted video or no video issues .  The affected computers  were manufactured between approximately May 2007 and September 2008. 

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