I'm pulling my hair out over this. My 5.1 Speaker set, SBS 580, have 3 outgoing channels. And for whatever reason I'm getting no Center/Sub sound. My rear speakers have decided only one wants to work. And it seems that no matter how I configure the lineout ports, the sound refuses to work properly.

Before you ask, I know the speakers work, as I've isolated each speaker and tested them on the front left channel.

PC is in the sig. Is anyone else having sound issues like this?