handy Mac bootup hotkey combinations


Personally I like the cmd-opt-shift-delete-# combination most… how much more complicated could they’ve made it?

Key Combination Effect
mouse down Eject removable media
opt Bring up OF system picker on New World machines
cmd-opt Hold down until 2nd chime, will boot into Mac OS 9 ?
cmd-x (or just x?) Will boot into Mac OS X if 9 and X are on the same partition and that’s the partition you’re booting from
cmd-opt-shift-delete Bypass startup drive and boot from external (or CD). This actually forces the system to NOT load the driver for the default volume, which has the side effect mentioned above. For SCSI devices it searches from highest ID to lowest for a partition with a bootable system. Not sure about IDE drives.
cmd-opt-shift-delete-# Boot from a specific SCSI ID # (# = SCSI ID number)
cmd-opt-p-r Zap PRAM. Hold down until second chime.
cmd-opt-n-v Clear NV RAM. Similar to reset-all in Open Firmware.
cmd-opt-o-f Boot into open firmware
cmd-opt-t-v Force Quadra AV machines to use TV as a monitor
cmd-opt-x-o Boot from ROM (Mac Classic only)
cmd-opt-a-v Force an AV monitor to be recognized as one
c Boot from CD. If set to boot to X and no CD is present, may boot to 9.
d Force the internal hard disk to be the startup device
n Hold down until Mac logo, will attempt to boot from network server (using BOOTP or TFTP)
r Force PowerBooks to reset the screen
t Put FireWire machine into FireWire Target Disk mode
z Attempt to boot using the devalias zip from first bootable partition found
shift (Classic only) Disable Extensions, (OS X, 10.1.3 and later) Disables login items. Also disables non-essential kernel extensions (safe boot mode)
cmd (Classic only) Boot with Virtual Memory off
space (Classic only) Trigger extension manager at boot-up
cmd-v (OS X only) show console messages during boot
cmd-s (OS X only) boot into single user mode

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