What is BIOS

What is BIOS?

BIOS – an acronym for Basic Input/Output System and also known as the System BIOSROM BIOS or PC BIOS. It is pre-installed on Windows computer system boards, you don’t find it on MAC computers. BIOS helps Windows operating systems to load further. As BIOS firmware check each and every hardware that connected to computer. If all connected or required hardware are connected and working properly, it allow Windows to load further.

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How does BIOS work?

The BIOS is a program pre-installed on Windows-based computers that the computer uses to start up. The CPU accesses the BIOS even before the operating system is loaded. The BIOS then checks all your hardware connections and locates all your devices. If everything is OK, the BIOS loads the operating system into the computer’s memory and finishes the boot-up process.

Menu Options available on BIOS settings.

You view and manage below settings on any Windows based BIOS. Usually you may find below menu options on BIOS screen. BIOS has a Setup utility stored in the BIOS flash memory. The configured data is provided with context-sensitive Help and is stored in the system’s battery-backed CMOS RAM. If the configuration stored in the CMOS RAM is invalid, the BIOS settings default to the original state specified at the factory.

  • Main – General product information, including BIOS type, processor, memory, and time/date. The BIOS Main menu option provide general product information, including BIOS, processor, system memory, and system time/date.
  • Advanced – Configuration information for the CPU, memory, IDE, Super IO, trusted computing, USB, PCI, MPS and other information. The BIOS Advanced menu option provides detailed configuration information for the CPU, memory, IDE, Super IO, trusted computing, USB, PCI, MPS and other system information.
  • PCI – Configure the server to clear NVRAM during system boot.
  • Boot – Configure the boot device priority (storage drives and the DVD-ROM drive). The BIOS Boot menu option enable you to configure the boot device priority (storage drives and the DVD-ROM drive).
  • Security – Set or change the user and supervisor passwords. The BIOS Security menu enable you to set or change the supervisor and user passwords.
  • Chipset – View the configuration of server chipsets. The BIOS Chipset menu option enable you to set the chipset parameters.
  • Exit – Save changes and exit, discard changes and exit, discard changes, or load optimal or fail-safe defaults. The BIOS Exit options enable you to save changes and exit, discard changes and exit, discard changes, or load optimal defaults

C:\Users\Canous\Desktop\Screenshot\BIOS menu.jpg

How check your computer BIOS version?

The BIOS information is also shown in the Windows System Information utility. To open this utility, click START, Programs, Accessories, System Tools, and then System Information. If you’re running Windows Vista or Windows 7, or Windows 10 type System Information in the Start search box. You also see this information on POST screen – Power On Self Test.

C:\Users\Canous\Desktop\Screenshot\Bios versions.jpg

What is boot menu? How to access it?

The boot menu is a menu accessible when a computer is first starting up. It can contain a number of different device options to boot to, including CD, DVD, Flash or hard drives, and a LAN (network). The boot menu allows a user to load up other operating systems or applications, even if the computer itself already has an operating system on it. It is also useful when trying to install a new operating system on a computer, and the user needs to load the installation application from a CD or DVD.

How to boot into BIOS

To boot into BIOS you may have to power on the computer and press keys on computer. More specifically, it depends on the motherboard, as this is where the BIOS is located. Common keys to enter the BIOS are F1, F2, F10, DEL, ESC, as well as key combinations like CTRL + ALT + ESC or CTRL + ALT + DEL, although those are more common on older machines. Also note that a key like F10 might actually launch something else, like the boot menu. The exact key or key combination depends on your computer manufacturer and model.

Below is a list of PC brands with their corresponding hot-keys.

Manufacturer Models Boot Menu Key Bios Key
Acer Aspire One zg5, zg8, Aspire Timeline F12 F2
Acer Aspire v3, v5, v7 F12 (“F12 Boot Menu” must be enabled in BIOS) F2
Acer Esc, F2, F12 Del, F2
Asus Desktops F8 F9
Asus VivoBook f200ca, f202e, q200e, s200e, s400ca, s500ca, u38n, v500ca, v550ca, v551, x200ca, x202e, x550ca, z202e Esc Delete
Asus N550JV, N750JV, N550LF, Rog g750jh, Rog g750jw, Rog g750jx Zenbook Infinity ux301, Infinity ux301la, Prime ux31a, Prime ux32vd, R509C, Taichi 21, Touch u500vz, Transformer Book TX300 Esc (Disable “Fast Boot” and “Secure Boot Control”) F2
Asus k25f, k35e, k34u, k35u, k43u, k46cb, k52f, k53e, k55a, k60ij, k70ab, k72f, k73e, k73s, k84l, k93sm, k93sv, k95vb, k501, k601, R503C, x32a, x35u, x54c, x61g, x64c, x64v, x75a, x83v, x83vb, x90, x93sv, x95gl, x101ch, x102ba, x200ca, x202e, x301a, x401a, x401u, x501a, x502c, x750ja F8 Delete
Asus Eee PC 1015, 1025c Esc F2
Compaq Presario Esc, F9 F10
Dell All Models F12 (Select “USB Flash Drive”) F2
eMachines All Models F12 tab, Delete
Fujitsu F12 F2
HP Esc, F9 Esc, F10, F1
HP Pavilion Media Center a1477c Esc F10
HP Pavilion 23 All In One Esc (Select boot media from the menu) F10
HP Pavilion Elite e9000, e9120y, e9150t, e9220y, e9280t Esc, F9 F10
HP Pavilion g4, g6 and g7, Probook 4520s, 4525s, 4540s, 4545s, 5220m, 5310m, 5330m, 5660b, 5670b Esc F10
HP Pavilion HPE PC, h8-1287c, Pavilion PC, p6 2317c, Pavilion PC, p7 1297cb, TouchSmart 520 PC, ENVY x2, m4, m4-1015dx, m4-1115dx, sleekbook m6, m6-1105dx, m6-1205dx, m6-k015dx, m6-k025dx, touchsmart m7, Envy, dv6 and dv7 PC, dv9700, Spectre 14, Spectre 13, 2000 – 2a20nr, 2a53ca, 2b16nr, 2b89wm, 2c29wm, 2d29wm Esc (Then f9 for “Boot Menu”) Esc
HP 2000 Esc (Then F9 for “Boot Menu”. Select “Patriot Memory” on the Boot Option Menu) Esc
HP Pavilion a410n Esc F1
Lenovo Desktops F12, F8, F10 F1, F2
Lenovo Laptops F12 F1, F2
Lenovo ThinkPad edge, e431, e531, e545, helix, l440, l540, s431, t440s, t540p, twist, w510, w520, w530, w540, x140, x220, x230, x240, X1 carbon F12 F1
Lenovo IdeaPad s300, u110, u310 Touch, u410, u510, y500, y510, yoga 11, yoga 13, z500 Novo Button (Next to power button), F12 Novo Button
Lenovo IdeaPad P500 F12 or Fn + F11 F2
Lenovo IdeaPad S10-3, g460, g470, g475, g480, g485 F12 F2
Microsoft Surface Pro 1-3 Volume-Down Button
Microsoft Surface Pro 4 & Book Volume-Up Button
Packard Bell F8 F1, Delete
Samsung F12, Esc F2, F10
Samsung NC10, np300e5c, np300e5e, np350v5c, np355v5c, np365e5c, np550p5c Esc F2
Samsung Series 5 Ultra, Series 7 Chronos, Series 9 Ultrabook Esc (Must disable “Fast Boot” in BIOS) F2
Samsung Ativ Book 2, 8, 9 F2 (Must disable “Fast Boot” in BIOS) F10
Sharp F2
Sony VAIO Duo, Pro, Flip, Tap, Fit Assist Button (Use the Assist Button when the computer is off, not when it is booting) Assist Button (Use the Assist Button when the computer is off, not when it is booting)
Sony VAIO, PCG, VGN F11 F1, F2, F3
Sony VGN Esc, F10 F2
Toshiba Kira, Kirabook 13, Ultrabook, Qosmio g30, g35, g40, g50, Qosmio x70, x75, x500, x505, x870, x875, x880 F12 F2
Toshiba Protege, Satellite, Tecra F12 F1, Esc
Toshiba Equium F12 F12
Gigabyte F12 DEL
Intel F10 F2
Asrock F11 F2, DEL

That’s it. Contact us on forum for further support.


Arun Prabhakar

Arun Prabhakar immensely interested in following Windows and other technology developments. Being passionate Windows blogger, he loves to help others on fixing their computer issues.