BIOS setup is a built-in firmware utility for viewing and changing selected startup and hardware settings on a computer. On modern devices, it is often called UEFI/BIOS setup. It is not an app you install, and its available options and access method depend on the computer model.
What BIOS setup does
The setup utility is part of the computer’s firmware. It gives users access to selected low-level configuration options; the exact menu and settings vary by model and firmware version. Common categories include boot order, storage, security, power management, and device options. HP describes these options for its desktop PCs, while Oracle documents a setup utility embedded in its server BIOS firmware.
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Firmware runs early in startup, before the operating system. Lenovo describes UEFI/BIOS as the first program to run when a computer starts, initializing hardware and loading the operating system and other programs. The setup utility lets users change certain firmware settings; it is not a general-purpose control panel for the operating system.
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BIOS is the familiar name, but contemporary computers commonly use UEFI, the modern firmware interface. As a result, manufacturers and support guides often label the settings screen “UEFI/BIOS” or refer to it as BIOS setup. The labels and layout are implementation-dependent, so two computers may expose different options even when both use UEFI.
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At the specification level, the UEFI boot manager reads firmware configuration variables to determine the order for loading UEFI drivers and applications, including operating-system boot loaders. That explains how boot-order settings relate to starting the computer; it does not mean every manufacturer presents those settings with the same name or screen design. See the UEFI Specification 2.11 boot manager documentation.
BIOS setup versus the one-time boot menu
Use BIOS/UEFI setup when you need to inspect or change a persistent firmware setting, such as the configured boot order. A one-time boot menu instead lets you select a device for the current startup without making that selection the standing boot configuration. Lenovo’s guide distinguishes changing the boot device in setup from using an interruption key to open a boot menu and choose a device.
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How to enter BIOS setup
There is no universal key or identical entry sequence. The correct instructions depend on the manufacturer, model, and firmware. These examples illustrate the differences; they are not interchangeable directions:
| Computer or guide | Documented entry method |
|---|---|
| Lenovo Slim 7/7i Pro X (2022) | Press F2 repeatedly when the logo appears; use Fn+F2 if hotkey mode is enabled. |
| Supermicro SYS-622BT-HNC8R | Press Delete during startup. The manual notes that other systems may use F1, F2, or another key. |
| HP desktop PCs in the cited instructions | Press Esc to open the startup menu, then F10 for the setup utility. |
For your own computer, consult the manual or manufacturer support page for its exact model. A key that works on one device may open a different menu—or do nothing—on another.
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Use firmware settings carefully
Changing firmware settings can affect how a computer behaves. HP warns that “A mistake might cause the computer to not perform as expected.” Before changing an option, make sure you understand what it controls and note its original value so you can restore it if needed.
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