For testing purposes, take the cover off your denon, get a hairdryer, find the dts chip on your hdmi board. Get the chip hot enough to have expanded and turn on the unit. If it comes up you have a solder issue. It will stop working again when the chip cools. You could fix it. Hot air gun, flux, thermal paste, heatsink. I have done this to 4 receivers from this era and it worked. It's on YouTube. 50 bucks for a fix or buy new.