are you sure you are putting in the password exactly as originally written sometimes users do not realise they have caps lock on etc .
even if you did have facial recognition or something similar ,it should not effect password acceptance .
have you tried using last known good configuration during start up ,to do this start the computer and press and hold the F8 button (this must be done before the windows logo screen comes up .if it does not work first time ,try again.
you will se an options screen in black and white ,scroll down to last known good configuration using the up/down arrow keys .and select it and click enter .
if there are other reasons for the OS not responding this often works .