Richard
All drivers are up-to-date. ( Hope I didn't miss any!).
F_S_D
I did as you suggested. The computer ran thru a normal shutdown. On manual re-start, it went thru CHKDSK and the message at the end said that, "The volume is clean".
Did a START - Shutdown - Re-Start and it is still the same; it shuts down completely. Manual re-start required.
I'm mystified.
LC