I've had this continuous startup loop happen to me twice in the past, both times on different Evesham machines. I had the same as you, none of the options would work. The only advice Evesham could give was to reformat and start again. I don't see how a wrong password would lock a computer, this could be a red herring. After trying all I could think of at the time I had to accept it. The only cure was to reformat.