I have an old Sony STR-DB1070 with Sony Pascal SA-VE835ED 5.1 speakers. I am using an optical cable from my XBOX 360 Slim 250GB console going into the back of the receiver. My first issue is there is no sound from the speakers when the optical cable is put into the TV/SAT input, but I'm able to get sound when the optical cable is put into the MD/DAT input. The second issue is I only get sound on 2 speakers which are the front right and left. There is no sound coming from the others or the subwoofer. I've tried various settings on the receiver and nothing has worked. Can someone please help?