Locked out of Windows

Have been running Windows 10 on a Packard Bell laptop since August and suddenly the login screen password box is disabled on start up. None of the sign in screen options (power options, language, etc.) are enabled.
I can't get to any safe mode boot options either so at the moment I'm stuck.
Has anyone experienced similar situations or has anyone got any suggestions as to what may be causing this?

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(NT) If this happened to me, I'd restore from my full sys. backup
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Sadly yes.

Just last month 2 instances. Both were Seagate HDDs that failed in odd ways. What's annoying is the Seagate drive test passed but a drive wipe and OS install still failed. Very odd. New HDD and all better.

Both were pulled out and put into USB drive cases so the owner could get at their files. No tech I know tries to repair the OS if the owner didn't have backups.

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