Partition and Format the hard drive: Select Disk Utility from the main menu and click on the Continue button. Wait patiently – 15-20 minutes – until the Recovery main menu appears. Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Select the Recovery HD and click on the downward pointing arrow button. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. (Disk Utility is located in the /Applications/Utilities folder.) Open Disk Utility in macOS Recovery: Start up your Mac in macOS Recovery, choose Disk Utility in the Recovery app window, then click Continue. Use the Finder: In the Finder, choose Go x26gt Utilities, then double-click the Disk Utility icon. How do I get to the utility screen on a Mac? Wait for the MacOS Utilities screen to appear.The message will be replaced with a progress bar.Hold down those keys until you a spinning globe and the message Starting Internet Recovery.Hold down Command-Option/Alt-R and press the Power button.
Here is how to use macOS Internet Recovery: The firmware might have just gotten the wrong partiiton to boot from messed up, hold the option key down ona wired or built in keyboard while booting the computer, see if you can boot the Macintosh HD partition with OS X, then set Startup Disk in System Preferences to remind the firmware which correct partition it’s How do you get to OS X Utilities? How do I get out of macOS X Utilities screen?
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