This is the original poster. Thanks for both of the responses. Here is how I solved it - I had an 18 year old gadget geek fix it. Since my Kuro is old, the Yamaha receiver would not automatically configure itself. So the geek, working via the receiver, assigned the proper HDMI input to which I had plugged in the HDMI cable on the Kuro. Now on the Yamaha receiver, it knows that the HDMI is plugged into input 6. Works like a charm, The Sonos is attached to the receiver via AV2 and the Sony DVD player also runs through the receiver. All seem to be working. Still working on learning the MusciCast feature of the Yamaha receiver, but the original issue was resolved.