MAC System StartUp

Hold down these keys to cause a Mac to perform special actions at startup time.
C boot from CD or DVD
D force the boot device to be the internal hard drive
T start up in FireWire/Thunderbolt target mode (the Mac temporarily becomes a very expensive external FireWire/Thunderbolt drive)
X force boot into Mac OS X (older Macs that dual-boot into OS 9 and X)
N boot from Network drive
shift hold after power-up to boot into safe mode, hold after login to prevent startup items from opening
mouse button eject CD before booting normally
command-S boot into single user mode; type exit when done
command-option-O-F boot into the Open Firmware prompt
command-option-P-R reset PRAM
command-option-V verbose boot; show the Unixy text goodness at boot time
command-option-shift-delete bypass internal hard drive and boot from external drive or CD
option choose startup disk at boot time
command-. when startup disk chooser is active, open the CD tray

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