I recently acquired a new Pioneer VSX23TXH receiver and in the process swapped out my old DVI comcast cable box for a new Motorola HD3200 cable box. I'm running HDMI from the Motorola HD3200 to the VSX23TXH and HDMI out to a Samsung 50" plasma. I can receive SD signals no problem but when I switch to HD programming I only get audio. I've called comcast who have told me that the box is "activated on their side" this is the second box I've tried the first was the Pace RNG110 which did the same thing. I have a PS3 hooked up to the receiver also via HDMI and have no issues getting that signal to work properly. I don't think it's the HDMI cable because I'm getting SD. If the HDMI cable was bad I shouldn't get anything right? Any help is appreciated. I searched for this problem before posting but didn't find a good solution. Thanks for you feedback