Chris has written for The New York Times, been interviewed as a technology expert on TV stations like Miami's NBC 6, and had his work covered by news outlets like the BBC. By using Lifewire, you accept our, How to Access CPU and Memory Timing Settings in the BIOS, How to Access BIOS Setup Utility for Major BIOS Manufacturers, BIOS Setup Utility Access Keys for Popular Computer Systems, BIOS Setup Utility Access Keys for Popular Motherboards. UEFI stands for “Unified Extensible Firmware Interface”. You can set it up for the BIOS to wake up the computer or allow it to be done so by the OS. BIOS supports several hardware configuration options that can be changed through the setup utility. If your motherboard … lock down your computer with a boot password, enable Intel’s VT-x virtualization technology, How to Turn on Dark Mode at Sunset on Android, How to Configure Microsoft Teams Notifications, How to Enable Picture-in-Picture in Firefox, How to Change Contact Name Order on iPhone or iPad, How to Get a Spotlight-Style Search Bar on Windows 10, © 2021 LifeSavvy Media. Anything else is considered a cold boot. Whatever the screen looks like, you can use your keyboard or mouse to navigate through it. If you change your boot order and remove your hard drive from the list of boot devices, your computer won’t boot Windows (or whatever other operating system you have installed) until you fix your boot order. More recent Surface devices use a new UEFI called Surface UEFI. But now is the time to speed up your computer even more by delving under the hood and tweaking some more advanced settings. He writes troubleshooting content and is the General Manager of Lifewire. On virtually every computer available, the BIOS makes sure all the other chips, hard drives, ports and CPU function together. You should think of it as the software that allows communication and facilitates data transfers between the hardware components of a computer and the users or the software installed on that system. UEFI offers support for boot volumes over 2 TB in size, support for more than four partitions on a drive, faster booting, and enables more modern features. Chris Hoffman is Editor in Chief of How-To Geek. BIOS access and configuration on PC systems are independent of any operating system because the BIOS is part of the motherboard hardware. The BIOS performs the POST, which initializes and tests your computer's hardware. CMOS Setup The BIOS is the name of the ROM Chip that holds all the data about how to start the computer up, and perform POST,Power On Self Test etc. That's suicide. 8. BIOS (basic input/output system) is the program a computer's microprocessor uses to start the computer system after it is powered on. BIOS may refer to any of the following:. BIOSes are small programs with sizes that are close to 16 MB. Some of the common tasks that the BIOS performs include: A power-on self-test (POST) for all of the different hardware components in the system to make […] Tim Fisher has 30+ years' professional technology support experience. It looks for a peripheral component interconnect (PCI) bus and, if … How to Access BIOS The BIOS is accessed and configured through the BIOS Setup Utility. It is pre-installed on a personal computer’s motherboard and is the first software to run when powered on. The BIOS originally proprietary to the IBM PC has been reverse engineered by some companies (such as Phoeni… What’s a BIOS? CD first, then HDD). Here are some common things you can do in most BIOS systems: Before updating BIOS, check what version is currently running on your computer. To enter the CMOS Setup, you must press a certain key or combination of keys during the initial startup sequence. What Is UEFI? If you can’t find the option you’re looking for in your BIOS, consult the manual or help website for your PC. This program is not a part of your computer’s operating system (Windows). If everything is working correctly, it is not needed. If the version number on the website matches your BIOS version number, your BIOS is up-to-date and does not need updating. What Does a PC’s BIOS Do, and When Should I Use It? It initializes your hardware before booting an operating system from your hard drive or another device. Since 2011, Chris has written over 2,000 articles that have been read more than 500 million times---and that's just here at How-To Geek. The above article may contain affiliate links, which help support How-To Geek. Stands for "Basic Input/Output System." There are two ways to easily check for a BIOS update. Basic Input/Output System A set of computer instructions on firmware which control input and output operations. Unlike an operating system like Windows, which is often downloaded or obtained on a disc and needs to be installed by the user or manufacturer, BIOS comes installed from the moment the machine is manufactured. BIOS is an initialization of B asic I nput/ O utput S ystem and that’s why we just call it the BIOS. It checks the PS/2 ports or USB ports for a keyboard and a mouse. A value of 1234h indicates a reboot, and the BIOS skips the rest of POST. They are: BIOS (basic input/output system) is the program a computer's microprocessor uses to start the computer system after it is powered on. The following are some of the more popular BIOS vendors: Award Software, General Software, and Microid Research were BIOS manufacturers acquired by Phoenix Technologies. During the POST flow of a contemporary BIOS, one of the first things a BIOS should do is determine the reason it is executing. If there are multiple BIOS updates available, identify the motherboard installed on your computer using the information you wrote down from the System Information utility in the previous step. Intel vtx allows for several advantages, but first we should look at how virtualization works. This key is often displayed during the boot process with a message “Press F2 to access BIOS”, “Press to enter setup”, or something similar. You OS would fail to load, if not for the BIOS! The BIOS firmware comes pre-installed on a personal computer’s system board, and it is the first software to run when powered on. Boot The Computer – As the manufacture’s logo appear press the designated setup button to enter into the bios. Your BIOS will use a small chip on your RAM modules called an SPD (serial presence detect) chip to set memory timing and frequencies properly. It acts as an interface between the computer's hardware and the operating system. PCs that shipped with Windows 8 or 10 may require you access the UEFI settings screen via Windows 8 or 10’s boot options menu. It's BIOS that's responsible for the POST and therefore makes it the very first software to run when a computer is started. BIOS provides the microprocessor its first instructions upon activating the computer. The BIOS performs a "system inventory" of sorts, doing more tests to determine what sort of hardware is in the system. However, nowadays, BIOS has slowly been being replaced by UEFI (Unified Extensible Firmware Interface) in newer computers, which offers benefits like a better user interface and a built-in, pre-OS platform for accessing the web. During the POST flow of a contemporary BIOS, one of the first things a BIOS should do is determine the reason it is executing. The BIOS Setup Utility is accessed in various ways depending on your computer or motherboard make and model. One of the more advanced optimization techniques is BIOS tuneup. Determine your system's origins. The CMOS battery looks like a watch battery, and it powers the motherboard even when the computer is unplugged. BIOS or Basic Input Output System is hardware and the very first thing your computer reads in and runs when it is turned on. BIOS has several functions in a computer but its most important task is to load the operating system. This type of memory is also used for hard drives, but is not used for random access memory (RAM) and is integral to how the chip operates. When you start your computer, the computers boots the BIOS, which configures your hardware before handing off to a boot device (usually your hard drive). The BIOS system is separate from the active parts of a computer, the parts a user commonly interacts with. A Basic Input/Output System (BIOS) is an electronic set of instructions that a Personal Computer (PC) uses to successfully start up. Image Credit: ryuuji.y on Flickr and  Thomas Bresson on Flickr. If everything is working correctly, it is not needed. When a BIOS needs repair or updating, it goes through a process called flashing. The basic input/output system on a computer is typically stored on a non-volatile microchip called a BIOS chip, which is placed on the motherboard of the computer. 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