I have a set of Logitech x-540 5.1 speakers and the rear ones refuse to work. I have an X-Fi Fatal1ty and all the drivers/software asociated with it are updated. There's nothing on logitech's site as far as software or anything that I could find to match these speakers. They are plugged in correctly. The speakers do work. When I switch the front (green) plug on my sound card to teh rear or center jack on the sound card while leaving it pluged in the front position on the subwoofer all the correct speakers work. It's almost as if the rear and center/sw jacks on the sub were put there by mistake because they seem to serve no purpose whatsoever. I have the software and windows configured to run 5.1 but the rear speakers refuse to work. Any help would be greatly appreciated.