I can tell that there is something on the screen, but as you say it's like my vertical and horizontal hold is off. Like you sometimes get in Windows when selecting an invalid resolution for your screen.

I tried setting the frequency to 60Hz and that didn't make any difference. I'll try the analogue cable tonight and see if that makes any difference

Thanks for your help.
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Mk2a RioCar 120Gb - now sold to the owner of my old car
Rio Karma - now on ebay...