- #Boot imac operating system how to
- #Boot imac operating system install
- #Boot imac operating system upgrade
- #Boot imac operating system full
Shift-Option-Command-R isn't available. Option-Command-R installs the macOS that came with your Mac, or the closest version still available. Ĝommand-R is still the recommended way to start up from macOS Recovery. This combination makes sure that the installation isn't associated with your Apple ID, which is important if you're selling or giving away your Mac. If macOS Sierra 10.12.4 or later was never installed on your Mac, macOS Recovery works differently: If you never installed macOS Sierra 10.12.4 When the new owner starts up the Mac, they can use their own information to complete setup. If your Mac restarts to a setup assistant, but you're selling or giving it away, press Command-Q to quit the assistant without completing setup. During installation, your Mac might restart and show a progress bar several times, and the screen might be empty for minutes at a time. #Boot imac operating system install
If it 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.ġ Please allow installation to complete without putting your Mac to sleep or closing its lid.
#Boot imac operating system how to
You probably don't need to erase, unless you're selling or giving away your Mac or have an issue that requires you to erase. Learn more about when and how to erase.Īfter starting up from macOS Recovery, follow these steps to install macOS:ġĜhoose Reinstall macOS (or Reinstall OS X) from the Utilities window.ĢĜlick Continue, then follow the onscreen instructions to choose your disk and begin installation.ģ If the installer asks to unlock your disk, enter the password you use to log in to your Mac. If you need to erase your disk before installing macOS, select Disk Utility from the Utilities window, then click Continue. Decide whether to erase (format) your disk Install the macOS that came with your Mac, or the closest version still available.Ģ.
#Boot imac operating system upgrade
Upgrade to the latest macOS compatible with your Mac. Install the latest macOS that was installed on your Mac.
Command-R is generally recommended, especially if you never installed macOS Sierra 10.12.4 or later.
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following combinations on your keyboard. If you've got any further questions about using Secure Boot on the iMac Pro, ask away in the comments.See if you can upgrade to 10.12, 10.13, or 10.14, see sys requirements.
Click Restart to restart your iMac Pro with your new security settings in place. #Boot imac operating system full
Choose Full Security, Medium Security, and No Security. Click Enter macOS Password when asked to authenticate. Click Utilities in the Menu bar in the Utilities window. Immediately press Command (⌘) and R at the same time right after turning on your iMac Pro. To use Secure Boot, you'll need to enter the iMac Pro's Startup Security Utility immediately upon startup of your machine. Here's how you can use and manage Secure Boot on your iMac Pro. No Security - No requirements are enforced on on bootable operating systems. Medium Security - Any signed version of an operating system trusted by Apple can run on your iMac Pro. Full Security - Using this setting, the only operating systems that can boot on your iMac Pro are the version that is currently installed or a signed OS trusted by Apple. Used through the iMac Pro's Startup Security Utility, Secure Boot offers different levels of protection based on your needs. Secure Boot is a feature exclusive to the iMac Pro that lets your machine verify that it is booting a legitimate or supported version of macOS.
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