Keys to Hold Down
Starts up from a CD
Starts up from the first partition
Starts up from network server
Resets the PowerBook screen
Puts the Mac into FireWire Target Disk mode
Starts up in Mac OS X (if 9 is on the same disk)
Shows icons of all startup disks, so you can choose one for starting up.
Starts up from external drive (or CD)
Zaps the parameter RAM (PRAM). (Hold down until second chime.)
Brings up Open Firmware screen.
Shows Unix console messages during startup, logout, and shutdown
Starts up in single user (Unix command-line) mode
Ejects a stuck CD or DVD
Just after powering up: Turns off kernel extensions (Safe Mode (Safe Boot))
Later, after logging in: Prevents Finder windows and startup items from opening. (They’ll return the next time you start up.)