For some reason, I am only getting sound out of the one side of me PC Speakers. It is the 2 speaker and a sub. I know they work, because I plug them into my Ipod, and the work great, but when I plug them into my computer, I only get 1 side. They used to work fine in this computer, but one day, this happened. I have formated a few times since, but I still get the same results. any ideas?