Startup keyboard shortcuts on Apple Macintosh Intel computers
Intel-based Apple Macintosh computers have several keyboard shortcuts that can be used during the boot process to boot from a different drive, eject a disc, enter Target Disk mode, etc.
After you've turned your Mac on, wait for the Apple logo to appear then hold down one of the key combinations below until the rotating "loading" animation appears below the Apple logo:
X:
Force Mac OS X Startup.
⌘-⌥-⇧-⌫ (Command-Option-Shift-Delete):
Bypass primary startup volume and seek a different startup volume.
C:
Start up from a CD that has a system folder.
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 and non-essential kernel extension files.
⌘-V (Command-V):
Start up in Verbose mode.
⌘-S (Command-S):
Start up in Single-User mode.
Hold down the mouse button:
Eject the contents of the CD / DVD drive.
There is an additional startup keyboard shortcut to reset the machine's PRAM and NVRAM, but this should only be used if your Mac is experiencing hardware difficulties.
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