I just got my iMac back from apple. They replaced the hard drive and put a clean install of Mavericks on it. I just fired it up to get ready for resale and went through the setup process. Finally, it went to the login screen and won't do anything from there. I set it up to not require a password on log in, but entering owner (name I gave the user) with blank password or with the password does not work. It just has the picture of three people that says Other... Clicking that takes me to where I enter a username and password. Does anyone know what the hell is going on?