How to Get to Boot Menu on Mac?

How to Boot from USB?

Press the Power button to turn on your Mac or Restart your Mac if its already on. When you hear the startup chime, press and hold the Option key . Holding that key gives you access to OS Xs Startup Manager. Once the Startup Manager screen appears, release the Option key.

How to Boot a Mac from a USB

Press and hold the “Option” key when you hear the startup sounds—this will bring you to the Startup Manager. Once the Startup Manager appears, you can release the Option key. Startup Manager will then start scanning your device for drives it can boot from, including your USB.

How do I Manually Boot my Mac?

Press and hold down the Command ⌘ and Control Ctrl keys along with the power button or the ‌Touch ID‌ / Eject button , depending on the Mac model until the screen goes blank and the machine restarts.