Now, you can run UNIX commands to troubleshoot your computer. Release the keys when you see a black screen with white text on it.Press the power button and hold down Command and Option keys and the letters O and F as your Mac starts up.The closest thing you can do is boot in single-user mode and use the command-line interface to interrogate your Mac using Unix commands. On PowerPC Macs, you used to be able to press a key combination at startup to enter Open Firmware and view a diagram of connected devices, RAM configurations, and CPU information. How to enter BIOS on a MacĪs we mentioned earlier, users can’t enter UEFI on Mac. That’s why most of the things you could do in BIOS mode aren’t possible on Mac. They do so to protect the OS from unnecessary changes. Unlike in the Windows world, where Microsoft updates the OS and hardware manufacturers push out firmware updates, Apple controls both hardware & software and regularly updates UEFI.Īpple doesn’t allow users to navigate UEFI and adjust settings before the macOS loads. UEFI initializes hardware like your FaceTime camera and trackpad and loads the operating system. UEFI, or unified extensible firmware interface, is the name of the firmware in macOS that does the same job as BIOS on most Windows machines.
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