I just moved into a new house and now have Comcast cable service. I am having problems hooking up the Comcast DVR box (Cisco RNG200N) to my 5.1 Receiver (Onkyo TX-SR507). I am hooking it up through an HDMI cable, but when I switch to the appropriate input and turn on the cable box, it's saying "No Signal".
I have tested my Xbox 360, Sony Bluray player, and Apple TV which are all hooked up in the same manner (via HDMI to the receiver), and all work fine.
Why won't my cable box be recognized by the receiver? The cable box works fine when connected directly to my TV with the same HDMI cable.
Thanks in advance for help.