Re:Can you not use a HD PC monitor as a telly?
Not sure about converting HDMI to VGA.
To get scart/coax you'll probably have to pay quite a bit over the odds, usually it's just vga/dvi/hdmi.
S-video is **** and not suitable for much, S/PDIF is audio and would go into speakers IIRC, RS232-C...just looked it up and it's not a VGA port...can you scrap the digiboxes and get a TV tuner card for the pc? It'd make it a lot easier lol.