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Unter 10.4

Boot into single user mode (press Command-S at power on) /sbin/fsck -y [Enter] /sbin/mount -uaw [Enter] rm /var/db/.applesetupdone [Enter] reboot [Enter] oderpasswd ->It will prompt for your new password twice.

Unter 10.5

Boot into single user mode (press Command-S at power on) Type fsck -fy Type mount -uw / Type launchctl load /System/Library/LaunchDaemons/com.apple.DirectoryServices.plist Type dscl . -passwd /Users/username password, replacing username with the targeted user and password with the desired password. Reboot