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BIOS: Basic Input Output System In your computer


BIOS is a program built into personal computers that starts the operating system when you turn on your computer. It is also referred to as system firmware. BIOS is part of your computer's hardware and is separate from Windows.

Do I need to do anything with BIOS?

No, BIOS doesn't need to be managed and you don't need to change any settings. Advanced users might choose to change certain settings, such as the order the computer searches devices when starting.

What kind of BIOS does my computer have?

You can view general information about your computer's BIOS in System Information.
Click to open System Information.
Click System Summary in the left pane, and then look under BIOS Version/Date in the right pane to view the BIOS manufacturer, version number, and the date the BIOS was released. For specific information about the BIOS used by your computer, check the information that came with your computer or go to the computer manufacturer's website.

How do CMOS and ACPI relate to BIOS?

Complementary metal oxide semiconductor (CMOS) refers to a chip inside your computer that saves your BIOS settings. As a result, the terms CMOS and BIOS are sometimes used interchangeably. For more information, see What is CMOS?

Advanced Configuration and Power Interface (ACPI) is an industry standard that defines power management features and other configuration information for computers. Some previous versions of BIOS don't support ACPI, and so the computer might not successfully enter advanced power modes such as sleep or hibernate. For more information, check the information that came with your computer or go to the computer manufacturer's website.

How do I access my computer's BIOS?

Procedures vary depending on the BIOS manufacturer. Usually, you must press a key (such as F2, F12, Delete, or Esc) or a key combination immediately after you turn on your computer before Windows starts. For more information, check the information that came with your computer or go to the computer manufacturer's website.

How do I update BIOS?

Procedures vary depending on the BIOS manufacturer. If you think you need to update your BIOS, check the information that came with your computer or go to the computer manufacturer's website.

Warning
Be careful when changing BIOS settings. The BIOS interface is designed for advanced users, and it's possible to change a setting that could prevent your computer from starting correctly.
Updating BIOS should only be done if necessary (to solve a compatibility problem, for example). It can be a complicated process, and if an error occurs, your computer could be rendered inoperable. Be sure to follow the manufacturer's instructions exactly.

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