Start up from macOS Recovery
Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:
Try resizing your hard drive or partition if you receive errors associated with OS X being unable to install or start up your computer. This step can often help resolve problems associated with reinstalling OS X. Restart your Macbook Pro and launch Disk Utility. Select the disk you’re trying to restore in the left column of Disk Utility. To re-install Mac OS X Mavericks on your Mac you can either create a bootable USB drive or use the OS X Mavericks installer from the Recovery Drive. Creating a bootable USB drive has the fortuitous side effect of creating an emergency backup of the OS. In addition, the USB Drive makes it really easy to install Mavericks on your other Macs.
- Apple silicon: turn on your Mac and continue to press and hold the power button until you see the startup options window, which includes a gear icon labelled Options. Select Options, then click Continue.
- Intel processor: make sure your Mac has a connection to the Internet. Then turn on your Mac and press and hold Command (⌘)-R immediately until you see an Apple logo or another image.
If you're asked to select a user you know the password for, select the user, click Next and enter their administrator password.
Reinstall macOS
Select Reinstall macOS from the utilities window in macOS Recovery and then click Continue and follow the installer's instructions.
To Download And Restore Macos Your Computer's Eligibility Untrusted_cert_title
Follow these guidelines during installation:
- Allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac may restart and show a progress bar several times, and the screen may be empty for minutes at a time.
- If the installer asks to unlock your disk, enter the password you use to log in to your Mac.
- If the installer can't see your disk or notifies you that it can't install macOS on your computer or volume, you may need to erase your disk first.
- If the installer is for a different version of macOS to what you expected, find out about other installation options, below.
- If the installer offers you the choice between installing on Macintosh HD or Macintosh HD – Data, choose Macintosh HD.
When the installation is complete, your Mac may restart to a setup assistant. If you're selling, trading in or giving away your Mac, press Command-Q to quit the assistant without completing setup. Then click Shut Down. When the new owner starts up the Mac, they can use their own information to complete the setup process.
Other macOS installation options
By default, macOS Recovery installs the latest macOS that was previously installed on your Mac.* You can get other macOS versions using one of these methods:
- On an Intel-based Mac, you can use Option-Command-R at startup to upgrade to the latest macOS that is compatible with your Mac. Exceptions:
- If macOS Sierra 10.12.4 or later was never previously installed, you will receive the macOS that came with your Mac, or the closest version still available.
- If your Mac has the Apple T2 Security Chip and you never installed a macOS update, you will receive the latest macOS that was installed on your Mac.
- On an Intel-based Mac that used macOS Sierra 10.12.4 or later previously, you can use Shift-Option-Command-R at startup to install the macOS that came with your Mac, or the closest version still available.
- Reinstall macOS from the App Store instead of using macOS Recovery. If you can't install the latest macOS, you may be able to install an earlier macOS.
- Create a bootable installerand then use it to install macOS on your Mac or another Mac.
To Download And Restore Macos Your Computer's Eligibility
* If you've just had your Mac logic board replaced during a repair, macOS Recovery may only offer the latest macOS compatible with your Mac. If you erased your entire disk instead of just the startup volume on that disk, macOS Recovery may only offer the macOS that came with your Mac, or the closest version still available.