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Press and hold the C key on your keyboard immediately upon hearing the startup chime. Your Mac should start up from the OS X installer CD/DVD media.
(source)
To boot form the DVD:
Press and hold the C key on your keyboard immediately upon hearing the startup chime. Your Mac should start up from the OS X installer CD/DVD media
(source)
To boot from the DVD:
Press and hold the C key on your keyboard immediately upon hearing the startup chime. Your Mac should start up from the OS X installer CD/DVD media.
(source)
Press and hold the C key on your keyboard immediately upon hearing the startup chime. Your Mac should start up from the OS X installer CD/DVD media
(source)
