What’s CMOS and The way to Reset

What is CMOS and How to Reset

What’s CMOS

CMOS (Complementary Steel-Oxide-Semiconductor) is a sort of know-how utilized in digital units similar to computer systems, smartphones, and digital cameras. It’s a sort of semiconductor that permits for low energy consumption, excessive pace, and compact measurement.

In a pc, the CMOS is a small battery-powered chip that shops important system data such because the date, time, and {hardware} configuration. It’s used to maintain monitor of the BIOS (Fundamental Enter/Output System) settings, which management how the pc interacts with its {hardware} elements. With out the CMOS chip, a pc wouldn’t be capable of begin up accurately as a result of it couldn’t retailer that very primary information.

Generally, the chip might develop into corrupted, resulting in errors within the system’s {hardware} configuration. This may end up in points similar to incorrect date and time, error messages throughout startup, and system crashes. To repair these points, you might must reset the CMOS chip.

Resetting the CMOS chip entails clearing all the information saved in it, together with the BIOS settings. This can revert the system to its default {hardware} configuration, which might repair any errors brought on by a corrupted CMOS chip.

cmos battery located

The way to Reset CMOS

To reset the CMOS chip, you have to to comply with these steps:

Step 1: Flip off your laptop and unplug it from the facility supply.

Step 2: Open the pc case and find the CMOS battery. It’s often a small silver disk-shaped battery situated on the motherboard.

Step 3: Take away the battery by gently pushing down on the retaining clip and pulling it out of its socket.

Step 4: Anticipate 10-Quarter-hour to make sure that all the information saved within the chip is cleared.

Step 5: Reinsert the battery again into its socket, ensuring that it’s inserted accurately.

Step 6: Shut the pc case and plug within the energy supply.

Step 7: Flip in your laptop and enter the BIOS setup utility by urgent the designated key throughout startup. The important thing might range relying on the pc’s producer, however it’s often F2, F10, or Del.

Step 8: As soon as within the BIOS setup utility, you have to to reconfigure the system’s {hardware} settings to your most well-liked configuration. This will embrace setting the date and time, deciding on the boot machine, and configuring the CPU and reminiscence settings.


The CMOS know-how is an integral part of contemporary digital units, permitting for sooner, extra environment friendly, and extra dependable efficiency. Should you expertise points along with your laptop’s {hardware} configuration, resetting the CMOS chip could also be a helpful troubleshooting step. Nevertheless, you will need to observe that resetting the CMOS chip will clear all the information saved in it, together with the BIOS settings. Due to this fact, it’s important to backup your BIOS settings earlier than resetting  to keep away from shedding any important configuration information.

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This content material was written by the professional Velocity Micro employees.