hey guys, i bought a parasouns hca 600 amplifier for my subwoofer on ebay, i didnt get a power cable for it and i used a extra computer power cable for it and when i plug it in i get a buzzing in all of my speakers , unplug and gone, weird. just for the heck i broke the extra ground off of the cable and it is pretty much gone. Could the cable be totally wrong for this amp or maybe bad amp?