Del blog de jacsoft… Combinaciones de teclas para el arranque del Mac:

Bypass startup drive and boot from external (or CD)…. CMD-OPT-SHIFT-DELETE

Boot from CD (Most late model Apples) ................. C

Force the internal hard drive to be the boot drive .... D
Boot from a specific SCSI ID #.(#=SCSI ID number)...... CMD-OPT-SHIFT-DELETE-#
Zap PRAM .............................................. CMD-OPT-P-R
Boot into open Firmware ............................... CMD-OPT-O-F
Clear NV RAM. Similar to reset-all in open Firmware ... CMD-OPT-N-V
Disable Extensions .................................... SHIFT
Rebuild Desktop ....................................... CMD-OPT
Close finder windows.(hold just before finder starts).. OPT
Boot with Virtual Memory off........................... CMD
Trigger extension manager at boot-up................... SPACE
Force Quadra av machines to use TV as a monitor........ CMD-OPT-T-V
Boot from ROM (Mac Classic only)....................... CMD-OPT-X-O
Force PowerBooks to reset the screen................... R
Force an AV monitor to be recognized as one............ CMD-OPT-A-V
Eject Boot Floppy...................................... Hold Down Mouse Button
Select volume to start from............................ OPT
Start in Firewire target drive mode.................... T
Startup in OSX if OS9 and OXS in boot partition........ X or CMD-X
Attempt to boot from network server ................... N
   (Hold until Mac Logo appears)
Hold down until the 2nd chime, will boot into 9?....... CMD-OPT
OSX: Watch the status of the system load............... CMD-V
OSX: Enter single-user mode (shell-level mode)......... CMD-S