I've got GIGABYTE GA-P35-DS3L motherboard with optical audio out. I used optical cable and plugged it into my Pioneer 5.1-Channel A/V Receiver VSX-519V-K, I plugged my Polk Audio PSW10 Black 10-inch subwoofer into the receiver's presub out using a subwoofer cable, and a RCA to 3.5mm, neither worked. The woofer just hums as though nothing is happening. I also tried plugging in my 12 inch polk woofer with the subwoofer cable using its lfe unfiltered line in, and it also isn't working. Is my software to blame, or receiver? I hope I didn't somehow break the subwoofer out jack on my receiver but it seems so HELP!