Hello,
If nothing works on the Sign-in screen, boot your PC into the Windows Recovery Environment (WinRE) and run Startup Repair or System Restore to see if you can sign in.
To boot your PC into the WinRE:
- Turn on your Computer. When you see your PC Manufacturer's logo or the Windows Logo, turn off your computer by holding down the power button.
- Repeat the same steps 2-3 times.
- Next time, allow your PC to boot fully into WinRE.
From WinRE, select Troubleshoot > Advanced Options > Startup Repair.
If Startup Repair did not fix the problem, you can try System Restore to revert your PC to an earlier point in time.
Let me know if you still need more help.