Press the Power button to turn on your Mac (or Restart your Mac if it’s already on).
When you hear the startup chime, press and hold the Option key. Holding that key gives you access to OS X’s Startup Manager. Once the Startup Manager screen appears, release the Option key. The utility will look for any available drives that include bootable content.
Using either the pointer or arrow keys on the keyboard, select the USB drive you wish to boot from.
Once selected, either hit the Return key or double-click your selection. The machine will start to boot from the USB drive.
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Insert the USB boot media into an open USB slot.
Press the Power button to turn on your Mac (or Restart your Mac if it’s already on).
When you hear the startup chime, press and hold the Option key. Holding that key gives you access to OS X’s Startup Manager. Once the Startup Manager screen appears, release the Option key. The utility will look for any available drives that include bootable content.
Using either the pointer or arrow keys on the keyboard, select the USB drive you wish to boot from.
Once selected, either hit the Return key or double-click your selection. The machine will start to boot from the USB drive.
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