Key combinations for an Intel-based Mac Command (⌘)-R: Start up from the built-in macOS Recovery system. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the internet. macOS Recovery installs different versions of macOS, depending on the key combination you use. Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. …