It's a Vizio SV470XVT FHDTV. Just fyi, there's a note that says "The HDMI input on the LCD TV supports High-bandwidth Digital Content Protection (HDCP). So it appears I do have that!
Ok. Try this. Turn off DVR, turn off tv. Unplug HDMI cable. Wait a minute. Plug in HDMI cable, turn on tv then turn on DVR. See if that works. You may even have to remove power from both for this to work initially. Who knows.