I use Ethernet cable only.  WiFi is disabled.First day: After initial setup, I started using it without problem.  I did not access the web.Second day midday: I have this message when I logon: ‘Sign-in options disabled because of failed sign-in attempts or repeated shutdown.  Use different sign-in options or keep your device power on at least 2 hours and try again.  Sign-in options: (pin, or MS account password.)’  I reentered the pin several times, and still had the same message.  I never entered my MS account password.  I left the desktop on all night.Third day: I had the same message, and still could not sign-in.Fourth day: I restored from the system image.  With the one right after I set up the desktop, and before started using it.  I still had the same message.At the end: I removed the SSD and attached to another desktop as external drive.  All my personal info were there intact.Conclusion: The hack was in OS before I receive the desktop.  I cannot return the desktop because the SSD has my personal info.