Panic over :-)
The A1200 tower was one I had built to order and had delivered to me today. I think the courier gave the machine a kicking as it was all loose and hanging inside when I opened it up :-x
Hey - maybe he was an Atari ST fan :roll:
Still I re-seated everything and re-connected all the terminals and cables and it's booting now.
Thanks for the replies, guys.
Paul