Below is a listing of most of these methods, as well as other recommendations for entering the BIOS setup.
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This document does not help if you cannot enter the CMOS setup because it is password-protected. Computers manufactured in the last few years allow you to enter the BIOS setup using one of the five keys shown below during the boot process. F1, F2, and F10 are all function keys on the top of the keyboard. If F10 opens a boot menu, your setup key is likely F2. Setup keys are to be pressed as the computer is booting up.
How to Enter BIOS Command on a MacBook
Most users will see a message similar to the example below upon startup. Some older computers may also display a flashing block to indicate when to press the F1 or F2 keys.
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If your computer is new and you are unsure of what key to press when the computer is booting, try pressing and holding one or more keys on the keyboard to cause a stuck key error. Once you get this error, you should have the option to continue or enter setup. Documentation for the motherboard may also be found on the manufacturer's website. Once you have successfully entered the CMOS setup, you should see a screen similar to the example below. Your CMOS setup may look a little different, depending on the manufacturer, but should still have most of the same options in the menu on the left or along the bottom of the screen.
You may use the arrow keys along with the Enter key to select categories and change their values. Some manufacturers may have you press the Page up and Page down keys to change the values.
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If you are trying to change the clock, speed, or other settings and do not have the option available, it is because it is not supported by the motherboard. If you believe it should be supported, you may need a BIOS update.
If changes you made appear to revert to default settings or the date and time setting in the BIOS keeps falling behind, you may need to replace the CMOS battery. The Open Firmware interface allows you to view information regarding your CPU as well run diagnostic testing on the microprocessor. Once the command is submitted, Open Firmware displays the kind of microprocessor your computer is outfitted with, its clock frequency and its bus frequency.
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Booting into BIOS from bootcamp - Apple Community
Skip to main content. Display MacBook Device Tree Although your MacBook may seem at first glance to be a single mechanism, the machine is actually composed of a number of devices that work in congress with the operating system. References 1 Osxbook. Accessed 11 July