Thank you.
I have to admit we are at (beyond) the limits of my knowledge here. I'm away from the problem machine today, but will look further as soon as I can.
To ensure I am understanding properly, it is restoring the system image that I should re-try here?
I might have to come back on the BIOS mode setting, but I'll need to re-visit that when I am in front of the the machine.
Thank you all for your input so far. Greatly appreciated.