I set myself as the owner on my iBook the other day. Now when I start the computer, I get a black terminal screen as a login screen. It asks me to type in my username and password. It lets me type in my username, but when I try to type my password no characters show up, and it won't let me log in due to incorrect login information. Since everyone except me, the owner, has no access, there is no other login screen and it's just blank until I restart the computer and get the black screen over again. What do I do? Why aren't characters showing up when I type in my pass? I tried plugging in a third party keyboard but it didn't make any difference.