i just got a new pc and i put it all together. i hooked my audio system, which is a altec lansing 5.1 surround system as far as i remember i didnt have to install anything for them to work on my old computer, but im getting abslutely no sound now. i dont know why, im not the dumbest computer person, but i cant figure this one out. if anyone can help, that would be great. thanks.