Startup key combinations for Macs

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Intel-based Macs

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

Apple Boot Key Combos

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-#
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 (Hold until Mac Logo appears) N
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

After startup

Bring up dialogue for shutdown/sleep/restart POWER
Eject a Floppy Disk CMD-SHIFT-1 or(2) or (0)
Force current app to quit CMD-OPT-ESC
Unconditionally reboot CTRL-CMD-POWER
Goto the debugger (if MacsBug is installed) CMD-POWER
Reset Power Manager on PowerBooks USE THIS LINK
Put late model PowerBooks & Desktops to sleep CMD-OPT-POWER

Application Specific Keys

Startup key combos to reset the resolution on video boards:

SuperMac (at least some models) Press & hold OPT
Imagine 128 Card (reset resolution) N
RasterOps (at least some models) Press & hold CMD-OPT-SHIFT
Radius (Use cable sense pins to set resolution) U
Radius (Cycle through available resolutions) T

Conflict Catcher

Pause Boot P
Launch CC at Startup SPACE or CAPS LOCK
Skip remaining extensions CMD-PERIOD
Reboot cleanly while loading extensions CMD-R

RAM Doubler

Disable at Startup ~ (Tilde) or ESC

Apple System Installer

Change custom install to clean install CMD-Shift-K

Claris Emailer

Bypass specified startup connections Hold CMD at launch
Bring up rebuild options Hold OPT at launch