Hi I am bringing an old thread up, but to answer your question. I did have the HDMI cable from the TV to one of the ARC inputs on the receiver and then another HDMI cable from the Cable DVR to the Denon receiver. When I pulled out the HDMI cable from the TV to the ARC input I get a black screen with sound., this is running with the SAT/CBL mode. Is there another way to route the cables.
I am using a new Harmony remote and it is doing the same thing, so it's not the remote.