On sunday my dad and I bought the brand new 24" iMac, it is a great machine. However today when I went to login, all of the user accounts had disappeared and was replaced with "other...". When you click on it, it will ask you to type in your username and password but no matter what you type it will never let me on. I heard you can do this using terminal a while back, by hiding user accounts. However nobody here has done this, and as everybody else's account does not work it, so it raises some suspicions. My mom immediately thought we had been hacked, which I refuse to believe but it still is possible. We were using the beta of Safari and my sister had been using google images to find wallpapers. I downloaded Quicksilver, Adium, and Amua. That is it. We booted into single user mode and all accounts are there. I am very very very angry, and I want to know has happened. My G4 macmini still works, and this one is three days old and completely bust! Right now we are stuck with reinstalling the OS, is it a good idea to use the time machine backup?