If you have added any upgrades or expansions to the system, then you might consider removing them. If the Mac you are parting with is one of these systems, then first disable this authorization. For example, if you play your iTunes music on additional computers, you will need to authorize them to play any DRM-protected iTunes content. Next be sure to disable any services that are associated with your system, as some are machine-specific and require authorization of a limited number of machines to work. Either method should result in a full copy of your computer which you can restore or migrate to a new system, if needed. You can do this using Time Machine, or with a system cloning tool. The first step in any factory reset of the system is to completely back it up. Of course you might consider removing your user account from the system, and setting up a new administrative account for the new users, but the easiest and most thorough way is to fully format your system and reinstall OS X. Type rm /var/db/.AppleSetupDone and press Enter.If you are selling or donating your old Mac, then you might want to factory reset the system not only to provide the new users with a fresh start, but also to ensure your data is secured from the new owners.Power on or restart your Mac (should work for any Mac OS X system).Tricking your Mac into creating a new user account You will most likely have to enter it again to confirm. It won’t show itself on the screen, so be careful what you type. Type your desired password and press Enter.Type passwd username and replace “username” with the short name of the user account for which you’d like to reset the password.Type sh /etc/rc and press Enter/Return.Replace “password” with a new password of your choice.
passwd /Users/username password and replace “username” with one of the users displayed in the previous step. This lists all of the usernames on the computer – helpful if you don’t know or remember what these are.
Type launchctl load /System/Library/LaunchDaemons/ and press Enter.Wait for the checks to complete before going to the next step. At the prompt, type fsck -fy and press Enter/Return. This step is optional, but it’s a good idea because it checks the consistency of the hard disk before moving on.At the chime (or grey screen if your chime is turned off), hold down Command+S on your keyboard to enter single-user mode.Osx Reset Password Reset 10.5 Leopard & 10.6 Snow Leopard password Please check out the updated version of this post if you’re trying to reset the password on a Mac running 10.7 Lion or 10.8 Mountain Lion. This tutorial was written for Mac OS X 10.4, 10.5 and 10.6.
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