Hello, thank you for reaching out to Microsoft Q&A.
Do you get any specific error code or message on the Windows Sign-in screen?
Depending on the error message on the screen, I can share the right steps to sign in to your device.
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Alternatively, did you make any recent software or hardware changes to your computer? Such as Updating Windows or BIOS?
Do you have an option to reset your PIN or Password from the Sign-in Screen itself?
If so, you can select 'I forgot my PIN' or 'I forgot my Password' option on the Sign-in screen to reset it.