How do you install OS X on a Mac?
Install macOS or OS X from Internet Recovery Mode, which you can boot into by holding option+command+R while your Mac powers up. Download the relevant macOS or OS X installer from Apple, then use Terminal to create a USB installer you can boot up from. Or use the OS X installation disc that came with your machine — or buy a new one — to boot up
Where do I find the installer for macOS High Sierra?
Download macOS Download a macOS installer, such as macOS Mojave or macOS High Sierra. When the macOS installer opens, quit it without continuing installation. Find the installer in your Applications folder as a single ”Install” file, such as Install macOS Mojave.
Where is the createinstallmedia command on a Mac?
For information about the createinstallmedia command and the arguments you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal:
Where do I find the installer for macOS Big Sur?
A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan These download to your Applications folder as an app named Install macOS [ version name ]. If the installer opens after downloading, quit it without continuing installation.
Do you need a disc to install OS X?
Use a Mac OS X installation Disc. If you’re unable to use Internet Recovery Mode or create a bootable USB installer, you can still use a Mac OS X installation disc. These discs are available for OS X Snow Leopard, OS X Lion, and OS X Mountain Lion. If your Mac is from 2012 or earlier, there was an installation disc in the original box.
How do I boot from a new hard drive on a Mac?
Power off your Mac from the menu or by holding the power button. Briefly press the power button, then immediately hold the option key while your Mac boots up. Release the key when a startup disk selection screen appears. Choose to boot up from your USB installer.
How to reinstall Mac OS from macOS recovery?
Reinstall from macOS Recovery. 1 1. Start up from macOS Recovery. To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following sets of keys on 2 2. Decide whether to erase (format) your disk. 3 3. Install macOS. See More….
How do I install Mac OS on a USB flash drive?
Connect your USB flash drive to the computer. Open Terminal from the Utilities folder in your Applications. Type sudo into Terminal, including the whitespace at the end. Open Finder and go to the ‘Install macOS’ app in your Applications folder.
Do you need to format a new hard drive to install OS X?
Format your new hard drive for macOS or OS X You may need to reformat your new hard drive before installing macOS or OS X on it. This erases everything on the drive. If you don’t want to lose data from your hard drive, export the data or back it up before continuing.