I happily have a philips tivo since few months ago and Im very happy with it and I have had no problems with it...until yesterday when I decided to swap my stu200 for a stu120. At the start I had no problems with the swap but since I wanted to use the tivo controller to control the cablebox I decided to reboot the tivo in guided mode but when I tried to fix the remote control the screen displayed that there wasnt any image coming from the cable box...so the I went to cablebox/recorder video options and it displayed no video....I have also tried my digital stb with s-video and novideo was shown again...

any hints of what im doing or could be wrong with the tivo?