When i try to use my speakers, i hear a popping sound and no sound comes out. What should i do?

I was using garage band, and suddenly i heard a short popping noise coming out of my computer speakers. Now when i try to listen to music, no sound comes out.

Did you try rebooting the computer?  
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD + OCZ Vertex 3 SSD Boot HD 

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