Startup shortcuts
Press the key or key combination until the expected function occurs/appears (for example, hold Option during startup until Startup Manager appears, or Shift until "Safe Boot" appears). Tip: If a startup function doesn't work and you use a third-party keyboard, try again with an Apple keyboard.
| Key or key combination | What it does |
| Option | Display all bootable volumes (Startup Manager) |
| Shift | Perform a Safe Boot (start up in Safe Mode) |
| Left Shift | Prevent automatic login |
| C | Start from bootable media (DVD, CD, USB thumb drive, and so forth) |
| 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) |
| D | Use Apple Hardware Test |
| Command-R | Use Recovery (OS X Lion or later) |
| Command-V | Start in Verbose Mode |
| Command-S | Start in Single User Mode |
| Command-Option-P-R | Reset NVRAM / parameter RAM |
| Hold down the Media Eject (⏏) key or F12 key, or mouse or trackpad button | Eject removable discs |
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