![]() Select Macintosh HD in the sidebar of Disk Utility. From the utilities window, select Disk Utility and click Continue. If asked, select a user you know the password for and enter their administrator password. Just press and hold the power button on your Mac until it turns off. Start up from macOS Recovery: turn on your Mac, then press and hold Command () and R immediately until you see an Apple logo or other image. If you're selling, giving away, or trading-in your Mac and want to leave it in an out-of-box state, don't use the setup assistant or your previously connected Bluetooth devices, if any.
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