Just to remind myself 🙂
Press Option
during startuo to boot into Open Firmware to select a boot device
Press :@:+Option+P+R
to reset Parameter RAM (PRAM) and non-volatile RAM (NVRAM)
Press (mouse button) to eject (internal) removable media
Press X
during startup Force Mac OS X startup
Press :@:+Option+Shift+Delete
during startup to bypass primary startup volume and seek a different startup volume (such as a CD or external disk)
Press C
during startup to start up from a CD that has a system folder
Press N
during startup to attempt to start up from a compatible network server (NetBoot)
Press R
during startup to force PowerBook screen reset
Press T
during startup to start up in FireWire Target Disk mode
Press Shift
during startup to start up in Safe Boot mode and temporarily disable login items and non-essential kernel extension files (Mac OS X 10.2 and later)
Press :@:+V
during startup to start up in Verbose mode
Press :@:+S
during startup to start up in Single-User mode (command line)
To turn on verbose boot logging all the time, in the terminal, type:
sudo nvram boot-args="-v"
You can find out the status of your boot args with
sudo nvram boot-args