Home Theater Questions? Ask a Technician for Answers ASAP
Hello, and sorry you're having problems. We are now connected on this website- which saves you money over having a Tech come to your home, and in many cases we can fix the problem you're having. In other cases, these things do require additional parts to fix. But I can help you with that as well.
First, have you tried replacing the HDMI cable with a new one yet? HDMI is digital and can be finicky by nature- causing dropouts and general instability when the cables go bad.
Also, how long of an HDMI cable run is this?
Additionally, have you tried a full processor reset of the Denon as outlined in the manual?
Feel free to reply back if you need more help, or want to reply back with more details. It does not cost you anything more to reply back once you've rated. Please do rate me positively (at least 3 STARS) and I will continue with you until this is sorted. The positive rating ensures I am credited for my work.
The procedure to reset the processor is outlined on page 70 of the Denon's manual at he link below: