2005 xc90 v8 fully loaded... And the headphones/stereo will only play the back ground noise of the movies. I've tried playing different DVDs, and I've tried different audio "levels" (5 of 5). I'm was thinking possibly a fuse? I've adjusted the balance, treble and bass. Nothing is working. Is there a surround sound option a accidentally clicked? Any help would be amazing, thank you so much.