If your video connection to the TV is HDMI, the TiVo gets signals back from the TV and turning the TV on/off could make a difference. I normally use the component outputs (3 video cables and 2 audio cables) from my TiVo because when I use the HDMI connection I get TiVo lockups occasionally. The other day, for test purposes, I reverted back to the HDMI connection. Then when I wanted to go back to the component connection I had to power cycle the TV before the component connection would be recognized as an input to the TV.