During an attempt to sign in, if Windows displays the Please wait for the User Profile Service message for a long time, say 5 minutes, then that post will help you ...

For everything that takes place on a Windows computer, the operating system considers it as an Event internally. So, when any processes or tasks go wrong, a user can trace out the exact breakpoint.

I can't think of what would cause it to destroy the user profile other than some kind of hardware issue or a software issue that resulted in deleted or damaged files. Maybe some kind of problem where ...

Nothing short of normal Windows updates have been installed recently, and I've no idea how long this problem has existed, as my standard user account along with the admin account still work just fine.