AMD4Life

I have a Kilpsch Promedia 4.1 Speaker system and unfortunately, I only have room for 2 speakers on my desk. At first, I was able to run the 2 speakers and the sub woofer, but now sound only comes from the woofer and main speaker with volume controls. I've tried everything I could think of, putting it back together, motherboard srivers, and sound drivers... Does anybody know what the problem is, or how to fix this?