Hello, Yesterday I bought Logitech Surround Sound Speakers Z506 and I have the CM6501 Sound Card (with the lastest driver version.) The Subwoofer, Left and- Right-front speakers produce sound. But I found out my Rear/Center Speakers doesnt produce any sound. But they can produce sound! When I do the 'sound test' there isn't any sound coming from it expept the fronts speakers. I installed everything correctly, I have put all cables in the right port. (I got the wrong cable dilivred in my package I got two Sound-Card cables and no Audo IN cable but that shouldn't be the problem because I did heard sound from rear speakers but the doesnt anymore.) What am I about to do?