How to Get to the BIOS in OS X

Basic Input/Output System (BIOS) is an interface found on PC computers. Mac OS X has its own version of BIOS called OpenFirmware or Extensible Firmware Interface. Just like BIOS on a PC, OpenFirmware can be used to communicate instructions to your operating system. For example, you can eject a CD, view a directory, change your boot order, and set up password protection.

Step

Restart your computer.

Step

Hold down the "Command," "Option," "F" and "O" keys simultaneously while your computer is booting up.

Step

Type your username and password if prompted. You will see the following text on your computer screen:

Step

"ok 0>"

Step

This indicates that you have entered OpenFirmware (BIOS).