Boot Up
Action (when pressed during startup)
Forces OSX startup
Bypass primary startup volume and seek a different startup volume (such as a CD or external disk)
Start up from a CD that has a system folder
Attempt to start up from a compatible network server (NetBoot)
Start up in FireWire Target Disk mode
Start up in Safe Boot mode and temporarily disable login items and non-essential kernel extension files (Mac OS X 10.2 and later)
Start up in Verbose mode.
Start up in Single-User mode