OS version?if its 10.5 or 10.6 then u can do this steps to unlock/reset your MAC
- Power on or restart your Mac.
- At the chime (or grey screen if your chime is turned off), hold down Command+S on your keyboard to enter single-user mode.
-. This step is optional, but it’s a good idea because it checks the consistency of the hard disk before moving on. At the prompt, type
fsck -fy and press Enter/Return. Wait for the checks to complete before going to the next step.
- Type mount
-uw / and press Enter.
- Type
launchctl load /System/Library/LaunchDaemons/com.apple.DirectoryServices.plist and press Enter.
- Type
ls /Users and press Enter. This lists all of the usernames on the computer – helpful if you don’t know or remember what these are.
- Type
dscl . -passwd /Users/username password and replace “username” with one of the users displayed in the previous step. Replace “password” with a new password of your choice. Press Enter.
- Type
reboot and press Enter.
rejoice!! unlock na imo MAC

careful next time...