I have two computers: Mac mini & Macbook I'm giving away the Mac mini, so I swapped out the 320GB HD for a 60GB one. I then took the 320GB HD and put it into my macbook. The Macbook boots up perfectly, all the user accounts and files are intact, but: When I try to do anything, like delete a file, or move a file, I need a username & password. Also, none of my settings stay intact in preferences. The first sign that something was wrong was when I couldn't change my desktop background. I don't know what the exact problem is, but obviously it's related to user authentication. Any solutions to this problem other than setting up new accounts?