I may still be confused, and if I am I apologize. I ran the cable to the cable box, the cable box to the receiver, and the receiver to the TV. The result was neither sound nor picture.
The cable goes into the cable box. Then I run an HDMI cable from HDMI out on the cable box to HDMI 1 on the TV. Then I run an HDMI cable from HD 4 on the TV to HDMI Out/Monitor ARC on the Denon receiver.
I was using a Firestick for certain 3rd party apps but now access them through my XFinity box.
I had my cable go into my Denon receiver which connected to my Comcast/Xfinity cable box which went out to my Sony smart tv. I was able to run the sound through my stereo speakers. But when I would use a third-party streaming app (such as HBOMax, before it became available through Comcast), my...