- Key presses at startup don't work | MacRumors Forums
- How to use the Mac’s mysterious startup keyboard combos
- Mac startup key combinations
Key presses at startup don't work | MacRumors Forums
It lets you choose a startup disk. Perhaps you have a Mac with two drives inside, or you have a backup stored on an external USB drive and you want to start up from that. In those cases, use the Startup Manager. Instead, you just hold down C when you start up, and keep it held down. If there is a connected disk optical or USB that contains a valid macOS installation, then your Mac will start from that instead of from its usual internal drive. Recovery mode lets you rescue a dead Mac by reinstalling macOS , either from a local source or from the internet.
After starting up with the Command-R combo held down, you will see your recovery options. Command-R will reinstall whatever version of macOS was on your Mac before it died. But if you hold down. You can also hold down Option-Command-R to upgrade to the latest version of macOS that will work with your Mac, or Shift-Option-Command-R to go in the other direction, and install the version that came with your Mac when it was new. My favorite aspect of this option is that — if you have a good, fast internet connection — it can actually be faster to reinstall from the internet than to reinstall from a DVD.
How to use the Mac’s mysterious startup keyboard combos
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Mac startup key combinations
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