Many Thanks to all who have offered assistance... it's a shame I couldn't get this thing up headless... but... well... it was a long shot.
In the end I was defeated by SCSI, ADB and Apple Video ports... at least with the Amiga it has a keyboard built in... You can output the video to a TV... and, in an unaccountable stroke of brilliance, Commodore saw fit to use IDE in their machines...
I really can't see much point to anyone wanting an old PowerMac :-)