I bought an old eMac at a garage sale and I was told that they were just using it for Internet. The lady was not aware of any passwords on the computer and when we started it up it didn't require anything. Turns out that the exhusband had set up the computer and gave all users admin privileges. The daughter had it set to log onto her account and she left a really obvious password hint so I know her password but the dad was the main user and I can't seem to do much without his password. Currently it has os 10.2.8 on it but I wanted to upgrade to whatever is the best it can take. I read tiger is the best but I don't think I can do it without the dads password. Is there a way to reset the whole system or wip it out and start all over? There is nothing saved on the compute that I need.