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Swap the jack in the back of your computer or at the sub woofer for the front and rear speakers. For example say your front right and left speakers don't work but your rear speakers do. First make sure theirs not a problem with the speakers themselves by identifying which channels do work and plugging some of the silent speakers in to those channels. My front left speaker channel was not working. I had similar problems with my logitech x-530 speakers.
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