On a Mac with OS X, most of the hardware settings must be altered within the
operating system, though there is an Open Firmware which is similar to BIOS that
can be accessed at boot. It is a command line interface that allows the user to
Open Firmware is stored is the first executed program on your MacBook and acts
as the platform for Mac OS X. Like the BIOS on PC machines, Open Firmware is
accessed on startup and provides you with an interface for technical diagnostics
If you are entirely sure that the computer is starting up with a connection to a
monitor, then this is a problem with the disk format more than likely. This will
make it so that the Mac will not be able to boot into recovery either. You'll need to
go to ...
Power up the computer and hold down the "Command," "Option," "0" and "F" keys
at the same time while booting. Step 3. Look for the "Ok" prompt which means the
Mac is operating normally and ready for the user's commands.
Dec 30, 2011 ... There is no BIOS on a Mac. It uses EFI, which can be configured from within OS X
e.g. using bless from the command line. You are able to boot from external USB
drives that satisfy some requirements. There are some key ...