TV Says "no signal" What to do?

I was just unfreezing and turning on volume and TV turned off. Turned it back on and it said "no signal." I rebooted, left it off for a while and it came back up with "no signal" again.



My other TV has both TV signal and Tivo connectivity and also shows the HDTiVo (that's the one that says "no signal"



Any suggestions of what to do. Cant figure this out.