Windows 10 hangs on boot

I have a slightly older Lenovo laptop (about 4 years old) that is running Windows 10.  When I went to shut down last night there was a long update that initiated.  When I woke up this morning the screen was black with the mouse cursor and the spinning dots that indicate Windows is "thinking".   Since it had been doing the update for almost 10 hours, I figured it was stuck, so I manually turned it off.  When I turned it back on I got the Windows logo, followed by the same black screen with the mouse cursor and spinning dots.  Please help me understand what this means and what I can do about it.

Thanks,

Phil
philsimmonsAsked:
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McKnifeConnect With a Mentor Commented:
Let me know if anything happens when you press shift together with F10 (when at the spinning dots). I guess nothing will happen, but if a command line opens, please launch the following commands
notepad C:\$Windows.~BT\Sources\panther\setupact.log
notepad C:\$Windows.~BT\Sources\panther\setuperr.log

Open in new window

(If you are unable to type ~, just use the tab key for autocompletion after typing c:\$windows)
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McKnifeCommented:
Solved? How?
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philsimmonsAuthor Commented:
Actually, the Shift-F10 didn't work, but in doing it I noticed the blue Thinkpad button.  I tried hitting it during boot-up, and that enabled me to bypass the problem.  Thanks.
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McKnifeCommented:
Fine. Next time please close by selecting your own answer :)
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Jake MikekCommented:
I have the same problem, only on a desktop, about 3 years old. Shift F10 did not work for me. Any other suggestions?
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McKnifeCommented:
You can try and simply turn it off (press the power button for 5 secs). Then restart it and, if no change, repeat it three times. See if that changes the behavior.
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