Amadeus 4.1 rear speakers won't output

[z1ggy]

Hey all, just bought this 4.1 system for my desktop. Im moving my 5.1 logitech system out to the living room for my ps3. The rear speakers won't output any sound at all, when I test them they won't work either, only the front two speakers work, and the sub works as well. I've checked the connections and everything is secure. I'm using on board sound and I checked to see if there was a drive update, but my sound driver is up to date, according to windows. Help!