I have a unique setup and bought the base model Roamio for OTA capability (no cable). I bought HDMI extenders over CAT5 and assumed it would work (works on other devices so I know the cables are working). When I connect the roamio I get nothing but I know that my TV is receiving a signal because the HDMI input is highlighted. I assume that the handshake between the roamio and HDMI extenders not working? Tech support was useless - they just said we do not support HDMI extenders. I refuse to go composite to cat5 due to poor resolution so this is my only logical option. Any advice?