I just bought a Soundblaster 5.1 sound card and some 5.1 Labtec speakers, When I follow the instructions and set everything up i can only ger subwooffer, back speaks and front speakers working. CANT GET CENTER SPEAKER TO WORK!! I know it works because I tried it on the other port but the port for center spekaer to comp doesnt seem to respond. It seems to be at the comps end where the rob is. PLEASE HELP.