Q:

What is the purpose of the CMOS?

A:

Quick Answer

The complementary metal-oxide semiconductor, or CMOS, chip is a motherboard component that stores the basic input/output system, or BIOS, settings of the computer. It comes with its own battery power to retain stored information regardless of the power state of the computer.

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Full Answer

In most cases, the CMOS battery works up to 10 years before needing a replacement. The CMOS chip loses all custom settings stored in it when it loses power. A user can usually suspect the CMOS battery is dying when the computer keeps showing a wrong system date and time and the BIOS setting keeps resetting to the default options every time the computer boots. Regardless of its battery level, a user can also revert the CMOS chip to its factory settings through the BIOS utility software.

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