human
How do I reinstall macOS on my Mac?
assistant
Install macOS
1. Turn on your Mac and press and hold Cmd+R.
2. Release the keys when you see the Apple logo.
3. Choose if you want to erase your disk.
4. Click to select Reinstall macOS.
5. Click Continue.
6. Follow the on-screen instructions to reinstall macOS including where to install it.