How to Get to the BIOS in Mac OS X (6 Steps)

Press the power button on your Mac system.
Pres and hold CMD, OPT and 'F' with your left hand. The CMD key has an apple on it and the OPT key is in the same position as the ALT key on a PC keyboard.
Press 'O' with your right hand.
Enter commands when the prompt '0 >' loads on the screen.
Type 'Mac-boot' and press 'Enter' to exit the firmware and continue booting the operating system.
Type 'Shut-down' and press 'Enter' to exit the firmware and shut down the computer.
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