Since it's been eight hours, and as PeterT has pointed out it could have actually shut down and just left the Black Page display in place, I will try to startup the device.
It wouldn't start and I had to hold the switch for a poweroff before I could start it up. It brought up the home screen for a second or two then went to the black processing screen and started the processing all over again. It has now reached 85% and remains there. It may have taken a little less time to get there, for this attempt.
Luck;
Ken
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