Power-On Self Test (POST)īIOS launches the POST process first to ensure that all attached hardware, such as the hard drive, RAM modules, CD ROM, etc., are all functional before proceeding further to boot up the OS. Let us discuss the various functions and roles of BIOS that make it an integral part of the computer system. We mentioned earlier in the article that there might not be a functional computer without a BIOS. Use the associated hotkeys to access and modify BIOS settings while the computer is booting up (before POST). Microsoft Surface BIOS: Press and hold the volume up button.Lenovo BIOS: F2 or (Fn+F2) or (Enter + F1).Note that these can be used in both UEFI and Legacy BIOS. You can use the associated hotkey mentioned below according to your manufacturer to access BIOS. To access BIOS, a hotkey such as F2, F12, or Del has to be pressed as the computer is about to load into Windows. Enter BIOS at startup using a hotkeyĪ hotkey is a key, or a set of keys, that perform a certain function when pressed together, or during a certain time period. If all goes well, BIOS then boots the Operating System from the hard drive. This is why you are receiving an error if your CMOS battery is running low or one of the attached hardware is faulty. These settings can be changed by accessing BIOS, as in the image above, which has been discussed further in the article.īIOS also performs a Power-On Self Test (POST) which is basically a self-test to ensure that all attached peripherals and devices are fully functional. It is responsible for properly booting your computer and has a set of instructions that controls the inputs and the outputs of the computer. Complementary Metal-Oxide Semiconductor (CMOS)īIOS is a hard-coded chip embedded within the motherboard of your computer.
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