When loading my MacBook Pro mid-2012, it prompts me with the usual login screen with my account picture and name such that I just have to enter a password. I enter my password and all is well.
After loading, it then prompts me with the more general login screen, where there are no users available, so you have to click other and enter the credentials. This login screen does not accept the username and password from before.
I have no other accounts on the system so I cannot login through them either. I tried the whole terminal reset password thing, but it said no users were available on the drive. I also tried the safe mode which had the exact same issues.