Key/Combo | What it does |
⌥ (Option) | Display all bootable volumes (Startup Manager) |
⇧ (Shift) | Perform Safe Boot (start up in Safe Mode) |
C | Start from a bootable disc (DVD, CD) |
D | Start up in Apple Hardware Test (AHT), if the Install DVD 1 is in the computer |
T | Start in FireWire target disk mode |
N | Start from NetBoot server |
X | Force Mac OS X startup (if non-Mac OS X startup volumes are present) |
⌘-V | Start in Verbose Mode |
⌘-S | Start in Single User Mode |
⌘-⌥-P-R | Reset NVRAM |
Mouse button | Eject CD/DVD and start up from hard drive |
Hold during startup | Description |
---|---|
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. |