
Howto :
1. When start your Mac hold + and press button Command + S.
2. It's should be your Mac entering terminal mode. Just type "mount -uw /" (without quote)
3. Type again "rm -f /var/db/.AppleSetupDone"
4. Then type "shutdown -r now"
Aftet step 4, easy and fast and efficient above, your Mac will restart again.. then voila!! Mac OS like brand new.. Welcome screen will show again. After that you can create
new Administrator login then reset your old account password.