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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