Circling white dots return after Windows 10 Anniversary update

After many attempts (described in another question), I finally got the Windows 10 Anniversary update installed.  All was well for a few hours, then I got a notification that I needed to restart.  Shortly after the restart, the circling white dots on a black screen appeared, and never progressed.  There was no message.  I have turned the computer off and on several times, in hopes that it would go back to the previous state, but that has not happened.  Any suggestions?
LVL 31
Helen FeddemaAsked:
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Scott CSenior EngineerCommented:
How long did you leave it running?  When I did my upgrade the whole process took almost 12 hrs.
Helen FeddemaAuthor Commented:
The upgrade did complete normally, as far as I could tell, going through many phases (at least three blue screen phases with % complete), and ending up on my Windows desktop.  This may be the last phrase of the upgrade, or possibly it was trying to restore some audio files I had to uninstall in order to get through the upgrade.  Usually the black screen with the circling white dots only lasts a minute or so.
Scott CSenior EngineerCommented:
Let it go over night and see what happens.

Other than that I suppose you could wipe the machine and just do a bare-meatal install using the now-available ISO.

https://www.microsoft.com/en-us/software-download/windows10ISO/

Or download the ISO and run the update from that.

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Helen FeddemaAuthor Commented:
I really would rather not do that (though I do have an up-do-date Carbonite backup if needed).  I will leave it on the circling white dots stage overnight.
Helen FeddemaAuthor Commented:
I downloaded the ISO and wrote it to a DVD in case I need it tomorrow.
Helen FeddemaAuthor Commented:
I left it circling overnight, and it was still hung on the circling white dots this morning.  But after I turned it off and on again, after a few seconds I heard the Windows opening sound, and my desktop opened!  So maybe something was going on overnight after all.
Helen FeddemaAuthor Commented:
Thanks for the link.  I didn't need it this time, but I have a Windows 10 DVD now in case of need in the future.
Scott CSenior EngineerCommented:
Sure thing.  Glad you're up and running.

I've had machines take an hour or so, and then I had that one that was 12 hrs.

Go figure.
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