I've been trying to troubleshoot the problem with my new Roamio not getting authorized for about 3 weeks. While both Tivo and Comcast are trying to be helpful, its not going anywhere. (I'm getting all channels but the premium ones and VOD freezes.). Tivo claims my SNR is too high. Its at the 42 level. Tried putting attenuators in place, to get it down to 36, but then I lose my internet connection. For grins, I wanted to see what my SNR on the TIvo is when absolutely nothing is plugged into it but the HDMI cable and Power. Right now, SNR is 19. Switched cable cards, it is 19. This is with nothing plugged into the coax. All other electronics, except for the TV turned off. Does it seem unusual that I start out with a 19 SNR level with nothing plugged in?