I have spent the day trying to get my Virgin TiVo box to work. When powered up it displays the 'Starting Up' screen for a few seconds, then the TV changes to a 'no signal' message and stays like that. Once the lights had stablised the box wasn't responding to remote commands and wasn't displaying anything on the screen. I found I could access the recordings from my other TiVo box across a network, so the hard disk is fine.
The curious thing was when the TV was powered off the box was flashing its remote light and responding to remote commands. Turning the TV on, however, it stopped responding to the remote.
I then pulled out the HDMI lead from the TV and plugged it back in - voila; picture and sound back on! I've never seen this sort of thing happen before with a loose HDMI connection. How come the Starting Up screen was displaying ok but not the main output?