slate_leeper wrote:

Win-10-64bit-Pro

Weird 1:
After rebooting the computer, pressing the Windows key results only in
a blank white box. Anything typed is ignored.

1 to 2 hours later, it starts showing the normal dark gray box and the
icons I have selected. However anything typed is still ignored.
Clicking the "All Apps" icon gives the list. Clicking on Cortana gives
the search box. Typing anything results in the blank white box. Same
result when pressing WindowsKey+S.

Task Manager shows Cortana as "suspended." There seems to be no option
to un-suspend.sfc /scannow found and fixed one corrupted file,
OneDrive.lnk. I don't use OneDrive, and can't imagine this being the
problem.

The DISM checkhealth option reported "no component store corruption
detected."

One website suggested shellexperiencehost being suspended might be
causing the problem, and that would show in TaskManager. TaskManager
does show Windows Shell Experience host as suspended, but again I
found no information on how to un-suspend.

Since you haven't looke at the Event Viewer to check, and to start
checking anew, I'd clear the events in Event Viewer and reboot. Then
look at Event Viewer to see what non-informational messages it had.

You could see if the inbuilt boot logging provides any clues. See:
https://www.tenforums.com/tutorials/...g-windows.html

https://docs.microsoft.com/en-us/win...ware/test/wpt/
I saw users mentioned a setting that let you monitor boot-time logging
of performance, found at:
https://answers.microsoft.com/en-us/...d-4216385c7ff3
https://helgeklein.com/blog/2013/07/...Speed=noscript

Of course, you could try booting Windows in its safe mode to see if the
boot lag problem goes away. If that worked, use msconfig.exe to disable
all startup programs and reboot into normal mode (but without all the
startup programs).