I have similar problem. Lock screen has password that I have always used. It started tuesday night telling me "incorrect password entered" continuously try to put the correct password in and makes me wait 30 seconds after every 5 attempts. passowrd was never changed but it never lets me in. some things that are important are not backed up and i want to avoid a factory reset. how do i bypass the password screen? Also never asks me for my google account information. please help!!!!!!!!