We recently got Comcast internet here, and since I have a HDTV I decided to get an HDDVR box to complement my TV. So far, it has worked pretty crappily. If I turn on the TV and cable box, the cable box freezes, the TV says "No Signal!" and moves across the screen, and the box is unresponsive to the remote control. I tried the DCH3416 or whatever it's number is and it did the same thing. In fact, I got the DCX3400 today as a replacement. It seems to want to do the...