Intel-based Macs
| Press C during startup
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Start up from a bootable CD or DVD, such as the Mac OS X Install disc that came with the computer.
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| Press D during startup
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Start up in Apple Hardware Test (AHT), if the Install DVD 1 is in the computer.
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| Press Option-Command-P-R
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Press until you hear two beeps. Reset NVRAM
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| Press Option during startup
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Starts into Startup Manager, where you can select a Mac OS X volume to start from.
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| Press N
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Make the the first bootable Network volume appear as well.
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| Press Eject, F12, or hold the mouse (/trackpad) button
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Ejects any removable media, such as an optical disc.
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| Press N during startup
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Attempt to start up from a compatible network server (NetBoot).
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| Press T during startup
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Start up in FireWire Target Disk mode.
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| Press Shift during startup
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Start up in Safe Boot mode and temporarily disable login items.
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| Press Command-V during startup
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Start up in Verbose mode.
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| Press Command-S during startup
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Start up in Single-User mode.
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| Press Option-N during startup
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Start from a NetBoot server using the default boot image.
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Apple Boot Key Combos
| Bypass startup drive and boot from external (or CD)
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CMD-OPT-SHIFT-DELETE
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| Boot from CD (Most late model Apples)
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C
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| Force the internal hard drive to be the boot drive
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D
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| Boot from a specific SCSI ID #.(#=SCSI ID number)
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CMD-OPT-SHIFT-DELETE-#
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| Zap PRAM
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CMD-OPT-P-R
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| Boot into open Firmware
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CMD-OPT-O-F
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| Clear NV RAM. Similar to reset-all in open Firmware
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CMD-OPT-N-V
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| Disable Extensions
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SHIFT
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| Rebuild Desktop
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CMD-OPT
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| Close finder windows.(hold just before finder starts)
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OPT
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| Boot with Virtual Memory off
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CMD
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| Trigger extension manager at boot-up
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SPACE
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| Force Quadra av machines to use TV as a monitor
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CMD-OPT-T-V
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| Boot from ROM (Mac Classic only)
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CMD-OPT-X-O
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| Force PowerBooks to reset the screen
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R
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| Force an AV monitor to be recognized as one
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CMD-OPT-A-V
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| Eject Boot Floppy
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Hold Down Mouse Button
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| Select volume to start from
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OPT
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| Start in Firewire target drive mode
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T
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| Startup in OSX if OS9 and OXS in boot partition
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X or CMD-X
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| Attempt to boot from network server (Hold until Mac Logo appears)
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N
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| Hold down until the 2nd chime, will boot into 9?
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CMD-OPT
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| OSX: Watch the status of the system load
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CMD-V
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| OSX: Enter single-user mode (shell-level mode)
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CMD-S
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After startup
| Bring up dialogue for shutdown/sleep/restart
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POWER
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| Eject a Floppy Disk
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CMD-SHIFT-1 or(2) or (0)
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| Force current app to quit
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CMD-OPT-ESC
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| Unconditionally reboot
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CTRL-CMD-POWER
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| Fast Shutdown
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CTRL-CMD-OPT-POWER
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| Goto the debugger (if MacsBug is installed)
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CMD-POWER
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| Reset Power Manager on PowerBooks
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USE THIS LINK
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| Put late model PowerBooks & Desktops to sleep
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CMD-OPT-POWER
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Application Specific Keys
Startup key combos to reset the resolution on video boards:
| SuperMac (at least some models)
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Press & hold OPT
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| Imagine 128 Card (reset resolution)
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N
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| RasterOps (at least some models)
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Press & hold CMD-OPT-SHIFT
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| Radius (Use cable sense pins to set resolution)
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U
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| Radius (Cycle through available resolutions)
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T
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Conflict Catcher
| Pause Boot
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P
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| Launch CC at Startup
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SPACE or CAPS LOCK
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| Skip remaining extensions
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CMD-PERIOD
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| Reboot cleanly while loading extensions
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CMD-R
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RAM Doubler
| Disable at Startup
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~ (Tilde) or ESC
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Apple System Installer
| Change custom install to clean install
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CMD-Shift-K
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Claris Emailer
| Bypass specified startup connections
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Hold CMD at launch
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| Bring up rebuild options
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Hold OPT at launch
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