Do Not Disturb

OS X Startup Key Combinations

Do Not DisturbWhen trying to install Yosemite to a fresh hard drive a couple of weeks ago, I realized my knowledge of OS X startup key combinations was very lacking.  I did a little research, and found the chart displayed below from Apple’s Support pages (To see the original document, click here). All the OS X startup key combinations and their uses can be viewed.

Note:  The OS X startup key combinations are entered AFTER starting the computer.  Keep holding key(s) until the mode or process you want starts.

Shift ⇧ Start up in Safe Mode.
Option ⌥ Start up to Startup Manager.
C Start up from a bootable CD, DVD, or USB thumb drive (such as OS X install media).
D Start up to either Apple Hardware Test or Apple Diagnostics, depending on which Mac you’re using.
Option-D Start up to either Apple Hardware Test or Apple Diagnostics over the Internet.
N Start up from a compatible NetBoot server.
Option-N Start up from a NetBoot server using the default boot image.
Command (⌘)-R Start up from OS X Recovery.
Command-Option-R Start up from OS X Recovery over the Internet.
Command-Option-P-R Reset NVRAM. Release the keys after you hear the startup sound again.
Command-S Start up in single-user mode.
T Start up in target disk mode.
X Start up from an OS X startup volume when the Mac would otherwise start up from a non-OS X startup volume.
Command-V Start up in verbose mode.
Eject (⏏), F12, mouse button, or trackpad button Eject removable media, such as an optical disc.

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