A:
Subwoofer not working? You'll need to check the sound options in your computer first. Go to Control Panel / Sound. Check to see if the subwoofer is turned on and not "muted." If all else fails, I believe you have a bad woofer. Normally, you don't have to do too much to a woofer to get it working. It's always good right out of the box, but if this is not the case, it could be defective.
Best of luck.