Reset Password OS X 10.5 Leopard
- 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
That's it. With it being so easy to reset your MAC's password, I would remind everyone to encrypt any important data in case your computer gets stolen.