Let's say you totally forgot the password to log on to your Mac. Or
maybe you purchased a used Mac from someone else and they've got it
locked down. There are numerous ways to reset a password with no OS X
discs
Reset 10.5 Leopard & 10.6 Snow Leopard password
- 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.
Reset 10.4 Tiger password
- 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.
- Type sh /etc/rc and press Enter/Return.
- Type passwd username and replace "username" with the short name of the user account for which you'd like to reset the password.
- Type your desired password and press Enter. It won't show itself on
the screen, so be careful what you type. You will most likely have to
enter it again to confirm.
- Type reboot and press Enter
Tricking your Mac into creating a new user account
- Power on or restart your Mac (should work for any Mac OS X system).
- 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 rm /var/db/.AppleSetupDone and press Enter.
- Type shutdown -h now and press Enter.
The third method of resetting your Mac's password requires some
additional explanation. Rather than simply changing the password like
the previous two methods do, this one fools the operating system into
believing it has never been started before. This means when you restart
the machine, it will take you through the entire setup &
registration process all over again. Do not worry, all of your
pre-existing data is still available. Just continue with this process
and do not choose the option to transfer or migrate information to the
Mac.
Once you're done, log in with your new admin account and go to System
Preferences > Accounts. You may have to click on the lock icon in
the lower-left corner before making changes here. You should see your
original user account(s) in the left column. Try clicking on one of them
to convert it to a standard user account (uncheck "Allow user to
administer this computer") and change the password. You should be able
to successfully log in to that account now and access all of your files
and programs. If you want, you can log back in with your new admin
account and re-check the "Allow user to administer this computer" option
in System Preferences to grant admin privileges to the original user
again.
That should cover it! As always, remember messing with single-user
mode and Terminal is risky and may lead to trouble if you make mistakes.
Considering you're already locked out of the computer, though, you'll
probably be willing to take your chances at this point.
One last thing... if you have a Keychain Access password, you will
probably need to reset that as well. You can do this by selecting
"login" under Keychains on the left and choosing Delete from the Edit
menu. You'll lose everything in the Keychain, but you'll now be able to
start fresh and add new ones.
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