I have hooked up my Gateway tower to an old Optiquest and it runs great but I cannot get my cds to work. I do get sound from my speakers. I pulled out all the wires to the tower and when I reconnected them I found a black wire (jack and plug for audio?) that I do not know where it goes. There is a space in the tower but I do not know where the other end goes. I believe this is my problem.