It's very unlikely this would be an HDMI cable problem. Cable problems would result in picture sparkles or loss of video, or failure to negotiate a connection at all. It's just when all equipment is turned on at the same time (I assume while HDMI handshake is occurring) that Hopper fails to recognize the AVR's ability to accept 5.1 audio and reverts to 2-channel audio. If Hopper comes out of stand-by BEFORE the HDMI equipment down stream of it are on, it appears Hopper will output 5.1 audio when the connection is eventually established. Likewise, if the down-stream equipment is on and stable before Hopper is "turned on", all is well. I have verified this with my universal remote by adjusting the power-on sequence: Turning Hopper ON before the AVR and TV works fine. No delays are necessary so there is only a fraction of a second between Hopper ON and AVR ON. Turning the AVR and TV on before Hopper causes issues UNLESS a delay is inserted before Hopper ON. 5 seconds is required for reliable behavior. Shorter delays work intermittently.