I have a sub woofer for a computer. First you hook it up to the computer, then the smaller sattellite speakers. the audio out jack on the back of the sub is wiggling alot, and i get no sound out of it. if i wiggle it aorund, i get some static. how do i fix this? i tried openening up the sub before, but didnt see the screws so I can open it. I just want to fix the jack. please reply soon. thnx.