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