How to enter or enter iMac BIOS step by step

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Catherine Le Nevez
@catherinelenevez
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In case you still don't know what the BIOS of your iMac device is about, in this post we will teach you the ins and outs and how it will help you in various ways if you find yourself in a complicated situation.

Your PC's BIOS is the essential tool with which your computer allows you to initiate a special boot sequence, which is activated when the device is turned on. Within iMac devices, what is known as a BIOS is correctly called OpenFirmware.



Which is used normally, when you need to start your own iMac via an external boot device, in order to clear all settings on your iMac, or if not, you need to boot from a Linux CD. It should be noted that you can also configure the BIOS so that your Windows computer has a better boot.

One of the reasons why users prefer use OpenFirmware is its easy access.

How to enter iMac BIOS step by step?

  1. To start, you need to turn on your device iMac by pressing and holding the power button firmly.
  2. Once the device is turned on, proceed with starting OpenFirmware which you can start by holding down the keys at the same time " Command " more " Option ”Plus“ O ”and“ F ”.
  3. Once this is done, you will hear two chimes, to which you will have to proceed while waiting for the activation of the next command, which you can check because "ok" will momentarily appear on the screen
  4. After this screen disappears, you will see that the command line will make a change and now it will appear " 0> ".
  5. After that you need to enter any command where you will open OpenFirmware, immediately after the “0>” indication.

With this you will have already logged into the BIOS from your device in just a few steps; however, it is important to strictly follow these steps for the sole purpose of maintaining the continuity of the steps described here.



What is macOS Safe Mode?

This is an option that is used on occasions when your Mac device cannot turn on and thus complete the automatic session startup process. For this reason, using this mode can help you solve this problem easily and without the need to resort to other tools that could damage your PC.

However, this method is known to be a special startup method that is uniquely designed to minimize and fix various errors that can occur when troubleshooting various errors.


It is for this reason that many of its functions are limited or simply not found in a common way as they would with normal computer login.

One of the most obvious examples of this is reflected in deactivation graphics acceleration, which is why it is possible for our screen to flicker at a few moments while turning on.


Likewise, another factor that will be affected will be the WIFI network, which may not work properly and therefore you will not be able to exchange files successfully.

Generally, when you log in to safe mode, our system will do a specific check of the boot disk, where it will try to solve the various directory problems, in addition to loading only the kernel extensions, which are essential.

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