Lee Benson

I have the Klipsch ProMedia Ultra 5.1 Speaker System (http://www.klipsch.com/products/details/promedia-ultra-5-1.aspx) for my computer. It connects my computer to my subwoofer via three 1/8" cables, and then the other speakers connect via the subwoofer. There is also a controller for adjusting the volume of Rear, Center and Sub channels. The problem is: I only get sound out of the subwoofer. The speakers don't play anything. I've tried different variations in my audio setup. I've made sure the cables are all in the right place, but I still get nothing out of the satellite speakers. Any ideas? Things to troubleshoot? Thank you in advance.