Sound in Macbook pro is not working correctly! PLEASE HELP!

A few days ago, the sound in the build in speakers in my macbook pro (Mac OS X 10.6.8) started not working correctly, i did not hit it or anything, just closed it down when i woke up the next day, the sound was not working correctly. i know it is hard to describe what's wrong in a written forum, but the best way to describe it is this: it sounds like when you have a set of headphones plugged in, but not wearing them. the sound is weak, with no bass. when i actualy do hear the sound when wearing headphones (in my ears) the sound is fine.
hope anyone can help.

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