Mike M wrote:
If that doesn't work you might want to try also removing the video
controller in Safe Mode which might manage to get you to normal mode
albeit in VGA mode until you install the correct driver for the card in
the new box.

If that also fails then remove ALL device in the Device Manger whilst in
Safe Mode and then try booting to Normal Mode. This should then allow
all of the new hardware to be (re)detected and the appropriate drivers
to be installed.
To Mart and Mike M.:
I did the first phase.
It acted exactly the same, hung at the '-' prompt.

I am considering what Mike recommends above,
but I hesitate, because if I remove *all* devices, will it necessarily
then install new drivers on boot-up? Could I not possibly be in a
condition where it won't even boot to Safe Mode?
And when you say "ALL devices".....that's quite a list; but you want me
to remove everything that appears on the list, correct?