I have a Denon 3300 that's about 6 years old. Last week it went on the blink. The "lock" light for the digital inputs does not light up anymore, and thus I get no sound. I assume there's some sort of problem with digital signal processor. Anyone have any suggestions on troubleshooting or how to fix this? Assuming it can't be fixed (or would cost more than it's worth), what are some good replacements? I've leaning to the Denon 3806, but other advice is appreciated. Also, I saw some models (Denon 4306) have a USB connection that can be used to connect an iPod. Any other models anyone knows about with these features?