Press and hold the power button until your Mac turns off. Press the power button again to turn on your Mac. When the Reset Password window appears, follow the onscreen instructions to create a new password. If you need to connect to Wi-Fi, move your pointer to the top of the screen and use the Wi-Fi menu to connect. To exit without resetting. Within Disk Utility, select the Erase tab and, in the resulting pane, click on the Security Options button. In the pane that appears, you have the option to wipe your drive's data in a number of. Reboot the Mac and right after the boot chime sound, hold down the COMMAND + R keys together to boot into Recovery Mode. Once in Recovery Mode and at the “macOS Utilities” (or “OS X Utilities”) screen, select “Disk Utility”. Choose “Macintosh HD” (or what the Mac drive is named), then select the “Erase” button. Type this command in Terminal: xartutil -erase-all; Press Return, type yes when asked if you are sure, and press Return again. Choose Terminal Quit Terminal. Step 6: Restart Your Mac in Recovery Mode Once you’ve backed up your data and signed out of everything, you are ready to wipe your Mac and give it a fresh start with a new owner.
**This was asked in 2008, so the first part of the answer below is relevant for Macs before OS X 10.7 (Lion) was released. Please continue reading below for OS X Version 10.7 and later as well.**
Answer:There is an easy way to get your Mac back to a “Factory Fresh” install of OS X. A set of Install / Restore DVDs is shipped with all modern new Macs**, and are most often grey in color. Look through the box the mouse came in to find the discs. Insert the disc and restart the computer holding down the [C] key. When you boot up of the DVD you will pick your language. Then, from the Utilities menu, select Disk Utility. In there select your hard drive (HD) and use the Erase tab to wipe the drive clean. After you are done, close Disk Utility and continue with the installation from that disk. After you have finished installing, the computer will reboot, taking you back to the original “new Mac” screen.
**Install/Restore DVDs no longer come with new or used Macs. Since Internet Recovery (described below), there is no need for discs, only an internet connection. This works for 10.7 and later. If you’re running 10.6 (Snow Leopard) or earlier, you will need an Install / Restore DVD as described above. These are available through Apple, PowerMax, and other sources.
OS X 10.7 (LION) OR LATER
Thankfully, we no longer have to mess with DVD. With OS X Recovery, we have a built-in set of tools to install OS X, repair and erase your HD, check your internet connection, and restore from Time Machine backup. It’s easy to get into OS X Recovery, too:
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Restart your Mac and hold down the Command + R keys until the Apple logo appears. From there, you’ll see an OS X Utilities window with the aforementioned options listed.
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Select Disk Utility and erase your HD, just as instructed to do in the first section of this article. After your HD is erased, resintall OS X. This will install the version of OS X that was first installed on that machine. From there, you can upgrade to the latest version if you choose.