The UEFI BIOS and standard legacy BIOS used in desktop and laptop PCs
This page – Introduction to the BIOS/UEFI BIOS
Page 2 – Using the standard BIOS ID number…
Page 3 – The BIOS beep codes…
Page 4 – Shutting Windows 8.1/10 down completely in order to enter the BIOS
Page 5 – The UEFI/EFI BIOS – including accessing/reflashing/updating information
Page 5 – Changing the boot order in a UEFI BIOS to enable booting from USB flash drives and CD/DVD drives
Page 6 – The standard BIOS – including setting the boot order of devices and reflashing/updating information
Page 7 – BIOSes are also capable of monitoring motherboard activities
Page 8 – The BIOS and overclocking
Page 9 – Common BIOS problems
Introduction to the BIOS/UEFI BIOS
This section of this website should provide the owners of desktop and laptop PCs with all of the information they need to know about the old-style standard legacy BIOS setup program that starts up from battery-powered flash RAM memory and the new UEFI/EFI BIOS that starts up from permanent, non-volatile memory that doesn’t use the motherboard’s battery when the computer is turned on, which then configures a computer’s hardware so that the operating system, mostly Windows, can recognise it and load its software device drivers.
The third-party developers of the new UEFI BIOSes are the same developers that created the Standard legacy BIOSes – AMI, Award, Phoenix, etc.
A standard legacy BIOS can be entered to examine or change before Windows starts to load by pressing its entry key, which is usually the Del or F1 key. An instruction on the startup screen says something like: “To enter setup press Del” or “DEL: Setup”. That entry method is also usually used by a UEFI BIOS, but that may not always the case because the UEFI can be entered from within Windows 8.1/10 by following a long click path and the motherboard manufacturer might want to make entry as difficult as possible. You should consult the PC’s user manual or its motherboard’s user manual for information on the UEFI. You can use the free CPU-Z utility to identify the make/model of motherboard and then visit the manufacturer’s website for the user manual, usually in the PDF format.
The image below shows that information provided by the user manual of a MSI motherboard from 2015. Click on the image to view its full size.
Some motherboards manufactured by MSI provide two UEFI BIOSes and a switch that allows switching between them. You should read your PC motherboard’s user manual to see what features it provides with regard to the BIOS itself and other components.
The following Wikipedia page on the UEFI BIOS goes into great detail on it:
Unified Extensible Firmware Interface – https://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface
Motherboard battery not used by a UEFI BIOS
Note that desktop and laptop PCs now store the UEFI settings in non-volatile permanent memory that retains information when the PC is switched off, which means that the UEFI does not require to make use of a battery supplied by the PC’s motherboard to retain its data. However, motherboards still have a battery because the Real Time Clock (RTC) that keeps date and time information has to be powered. The operating system takes its date and time from the RTC.
The UEFI is not accessed by pressing an entry key (Del, F1, etc.) at startup, it is accessed from within Windows 8.1 and Windows 10. The following short video shows the easiest but still very involved way in which to access the UEFI settings. UEFI access is much the same in Windows 8.1. Access has no doubt been made as difficult as possible so as to prevent users from screwing up their systems and then requiring support to come right.
Windows 10 – Accessing the UEFI (BIOS) Setup –
Windows 8.1 and Windows 10 PCs use a UEFI BIOS (instead of a standard legacy BIOS) that can be set in UEFI or standard legacy BIOS mode. Here is information on how to do that if the UEFI makes it possible in the first place:
Set up the BIOS in UEFI or legacy mode –
Note that if you are using a wireless keyboard, it might not allow you to enter the BIOS. In which case, you’ll have to use a wired PS/2 or USB keyboard. Moreover, when a desktop or laptop computer starts up – boots – only certain USB ports might be active during the boot, so, if you are using a wired USB keyboard and you can’t access the BIOS, try using the other USB ports.
Windows 8.1/10 when pre-installed on a new computer always uses a UEFI BIOS. Information on how to access it is provided further down in this article. Computers using Windows 7 and earlier versions of Windows usually use a standard legacy BIOS. Here is a webpage that deals with the problem that its title describes:
Dual Boot Windows 7 with pre-installed Windows 8 on GPT-formatted hard disk and UEFI BIOS –
Windows 8.1/10 is locked into its UEFI BIOS by something called Secure Boot that stops an unrecognised operating system or recovery boot discs from booting the system, which is a nuisance if you have to recover the system from a failure of some kind by using a recovery boot disc or the boot disc of another operating system, such as Ubuntu Linux, the installation disc of which can be used to run Ubuntu from its disc without installing it. The following post on this website deals with how to overcome this problem
How to recover a Windows PC from boot problems introduced by the replacement for the standard BIOS called the UEFI BIOS –
The different brand-name computer manufacturers and BIOS setup program developers use different keys or key-combinations to enter the standard BIOS. Visit this page if you need to know what the entry methods used by all of the main brands of PC and the major BIOS developers are:
Common BIOS-related problems are dealt with in this article instead of having their own section, because there aren’t many of them. Most BIOS-related problems are fixed by either updating or resetting the BIOS, both of which are dealt with in this article. If you have enabled setting and the computer fails to boot, enter the BIOS and enable the optimised or fail-safe default settings option. The Reset Configuration Data setting makes the BIOS reconfigure the hardware. Click on Common BIOS problems to go to them.
Reflashing/updating the UEFI and standard legacy BIOS
Information is provided on both the decades-old keyboard-accessed standard BIOS and the new mouse, touchpad or tap-accessed UEFI BIOS, which is required for hard disk drives that have a storage capacity greater than 2.19GB.
Note that the settings that are made accessible in a UEFI/BIOS depend on the computer’s manufacturer or the motherboard’s manufacturer if you buy or build a PC and install your own motherboard. If the computer is made for gaming enthusiasts, for example, if will no doubt provide a full range of customisable BIOS settings, such as settings that allow the overclocking of the components, running them faster than their stock speed, whereas if it is made for the typical home user, the computer manufacturer will probably provide only the basic settings in order to prevent the user from messing about in the BIOS and causing problems that require solving from its expensive support staff. For that reason, most laptop and netbook computers usually don’t have a BIOS that allows much in the way of customisation.
Information on reflashing – upgrading – the UEFI/BIOS – is provided in this article in these pages:
The contents of the standard legacy BIOS is held in flash memory, hence the name reflashing to upgrade it. If you are looking for information on reflashing the BIOS of a tablet PC, some of them have a standard PC-type BIOS that can be accessed and reflashed and others use inaccessible firmware of the same kind used by CD/DVD drives, network routers, etc., that can only be updated. The tablet manufacturer’s website should provide information on how to perform a reflashing. If not, some manufacturers provide email and forum support. Also, Amazon runs forum topics on some products that are accessed from the product’s buying page, such as the following thread that provides advice on how to update the firmware of a popular 7″ tablet PC:
The BIOS setup program – an acronym for Basic Input/Output System – is currently still a vital part of a PC’s system, without which nothing can work. It was present in the first PCs made by IBM and is still in use in now (2014), more than 30 years later. The standard keyboard-driven BIOS configures the PC’s hardware so that the operating system (Windows, Linux, OS X, etc.) can recognise all of it and install the appropriate software device drivers. The program itself is stored in a CMOS flash memory chip on the motherboard and it can be upgraded by reflashing the memory chip with the update according to predetermined procedures. However, the standard BIOS has been replaced in new computers by a mouse-driven Unified Extensible Firmware Interface (UEFI) BIOS, also known simply as an EFI BIOS.