Startup key combinations for Intel-based Macs

The table below lists what will happen when the following keys are pressed during startup:

Keystroke	Description
C	Start up from a bootable CD or DVD
D	Start up up in Apple Hardware Test (AHT) if the Install DVD 1 is in the computer.
Option	Starts into Startup Manager, where you can select a Mac OS X volume to start from
Eject, F12 or hold mouse button	Ejects any removable media, such as an optical disc
N	Attempt to start up from a compatible network server (NetBoot)
T	Start up in FireWire Target Disk Mode
Shift	Start up in Safe Boot mode and temporarily disable login items
Command-V	Start up in Verbose mode
Command-S	Start up in Single-User mode
Option-N	Start from a NetBoot server using the default boot image
Option-Command-P-R until you hear two beeps	Reset NVRAM