Music is 2.0 so there's nothing to fix. If you want all your speakers to play you need to enable something like speaker fill, all channel stereo, or pro logic.
For movies, make sure your media player is set to 5.1 playback.
I found the box for speaker fill and after checking that, my rear left/right and center started to work. But the sub woofer is still not playing, any ideas on what to do on that?
Thanks for your reply.