I hope you can help... I had cable co out to exchange regular cable box for an HD box for my hdtv. I have a receiver, surround sound and dvd player. Everything goes thru my receiver. I had great sound coming out of my reciver for tv, dvd, etc. But when he left, my tv volume is much lower than when I use the tuner. I also have no sound from receiver on my dvd now. Please help. Thanks a lot...