OS X Startup Commands

Start OS X in Forced Mode
<option> + <command> + <shift> + <delete>
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).
Force PowerBook screen reset.
T Start up in FireWire Target Disk Mode.
<shift> Start up in Safe Boot Mode. Temporarily disable login items and non-essential kernel extension files (Mac OS X 10.2 and later).
<shift> (held until second restart) Boots into "Safe Boot" mode, which runs Disk First Aid. The system will restart on completion.
<command> + V Start up in Verbose Mode.
<command> + S Start up in Single-User Mode. The results in UNIX command line.
<option> Boot into Open Firmware.Select a boot device.
<command> + <option> + P + R Reset Parameter RAM (PRAM) and non-volatile RAM (NVRAM).
(mouse button clicked and held) Eject (internal) removable media.

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