Do this:
1. Turn on your mac
2. At the same time Insert installation CD 10.5.6
3. Press and hold C button on keyboard
Now your mac must start up from the install CD. Select language. Then go to the menu>Reset Password program select your startup HD and reset the password. Remember that the keychain passwords will be locked for you. keychain store passwords for e-mail, Website logins and pass, shared disks and servers passwords, certificates and other personal information, if you don't need it delete it (when you update system it will inform you about it just delete it, if you don't delete it you will have problems with storing your own passwords and login information, because you don't have privileges to overwrite previous user information, so you always will be write login and password on websites with no save option)
Sorry For My English
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