In order to sort out the aspect ratio on my new Samsung TV, I apparently need to change the video input in the virgin TV settings. I've found how to do this on a TiVo box in that forum in help and settings, but can't find the equivalent menu for a standard Virgin tv box? Can anyone help? It's to change between 1080 and 720 etc. I'm using an HDMI cable to connect. Any help much appreciated!