what does bios do

What is Your PC’s BIOS? When is it used?

 BIOS or the Basic Input /Output System is the first thing that gets loaded when you switch your computer ON. This is the first thing that your computer does before it gets started. The use of BIOS setup utility is to load or initialize all the hardware of your computer. It is the first call of action from your computer to start your computer and load all the other elements. Some of the core level settings of your computer are available in the BIOS setup utility.

Recent years have marked the emergence of UEFI firmware along with all the modern computers. This UEFI firmware is known to be the successor of conventional BIOS. However, the difference between these two is negligible. Most of the modern computers are equipped with UEFI instead of BIOS, but many of them address their UEFI screen as BIOS setup. This improvisation is only done to cope up with the emerging technology in computing.

BIOS – Basic I/O System and UEFI

This is a firmware that the computer manufacturers attach to the motherboard of your computer. The BIOS is stored in a chip and this chip is strategically placed on your motherboard. It helps to control the hardware of your computer.

When we switch the computer ON, it boots the BIOS first. The BIOS then configures all the hardware of a computer for further booting. As soon as the hardware is ready, it transfers the boot up to the boot device. This BOOT device is normally the hard disc of your computer, or an external drive or flash drive sometimes.

UEFI is the upgradations of BIOS, it is also a firmware attached to the motherboard of your computer. As discussed earlier, it is the first thing that starts when we switch the computer ON. UEFI stands for Unified Extensible Firmware Interface. This creates the first interaction between the hardware of your computer and other programs, just like BIOS.

In reality, there is hardly any difference between BIOS and UEFI. These are low-level programs that are used to start the hardware of a computer.

These are used for the various purpose for your computer. With BIOS setup, you can change the Boot order or modify overclocking options. You can also use BIOS to setup a boot time password for your computer. This password is required before the system starts booting.

Go to BIOS or UEFI

You can easily access BIOS options or UEFI options if your computer says so. There are various ways of accessing BIOS or UEFI options in your computer. Some of the most important functions of BIOS setup is changing the boot order and setting up of a boot time password.

In order to access everything inside the BIOS setup utility, you have to recognize specific keys for each computer. But for every PC you need to restart it, in order to change it or get access to the options.

Restart your computer and as the computer starts booting, press F2 if you want to access BIOS.

If you want to change the settings, Press “Del” to enter the setup menu.

Some of the most common keys would be Del, F2, F1 and Esc. These will be needed to change the settings and browse through various BIOS options.

Most computers have predefined keys to access the BIOS options, it is displayed at the time of boot. If you restart your computer, you can see the press key message on the blank screen. Some computers have a message displayed on the blank startup screen.

If you are using a Windows 8.1 or 10, you have to access the UEFI settings using the main screen. You can do it by Windows boot menu options.

To use this function, press the shift key and click on Restart. This restarts your computer and gives you access to various BIOS menu options. Go to

Select Troubleshoot > Advanced Options > UEFI Firmware options.

This will display a boot menu option window with a number of options like system restore, Startup settings, and UEFI firmware options. This gives you access to the Firmware options and helps you to modify the BIOS settings.

Every user should be cautious about BIOS settings and should be cautious about changing it. Any un necessary change in the setting can be very problematic and may result in dysfunctionality of your system.