Which cord are you thinking of? If you look at the subwoofer there are 4 cords. One to the left tweeter, one to the right tweeter, one to the computer and one to the power.
What I would suggest is checking that the sub has not been turned down - one of the silver posts on the sub. If that is not the case and you cannot turn the sub volume up then I suggest that you replace the system. They probably cost more to repair than to buy new.
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