When the new owner starts up the Mac, they can use their own information to complete setup. If it’s not connected, connect the bootable USB installer now. If you're selling, trading in, or giving away your Mac, press Command-Q to quit the assistant without completing setup. Step One: Boot From Recovery Mode, or an Installer Your Mac’s Recovery Mode is a treasure trove of useful tools, and it’s the easiest way to wipe your computer and start from scratch. Your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time.Īfter installation is complete, your Mac might restart to a setup assistant. Allow installation to complete without putting your Mac to sleep or closing its lid.If the installer offers you the choice between installing on Macintosh HD or Macintosh HD - Data, choose Macintosh HD.If the installer doesn't see your disk, or it says that it can't install on your computer or volume, you might need to erase your disk first.Once pasted and corrected, press enter, then enter your password for macOS. If the installer asks to unlock your disk, enter the password you use to log in to your Mac. Make sure to change the element titled 'USBdrive' for the name of the drive you intend to become the bootable installer.Press and hold the Option (Alt) key immediately after turning on or restarting your Mac. To begin installation, select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.įollow these guidelines during installation: Install macOS from the Bootable Installer 1. Click the App Store app icon, which is blue with a white 'A' on it, in your Macs Dock. Reinstalling macOS does not remove data from your Mac. Downloading the macOS High Sierra Installer 1 Open your Macs App Store.

How to install macos from usb drive