I don't know what's wrong. I am listening to some songs today, and the sound is a little low, and to find out the 2 back speakers aren't working all of a sudden. Nothing has changed that I know of. I just got back from vacation. This computer has one of those surround sound things. The sub is working fine, as are the 2 front speakers. The back speakers(satellites) I hear no sound from. The main speakers with the volume control I don't hear sound from either, but the volume knob is working fine. I checked all the plugs to everything, and they are hooked up fine. Everything is on, I checked the audio properties, and I see no changes or anything wrong. Anyone have a clue? Could it be a fuse or something to those speakers? All of the speakers are connected in back of the sub.