The Complementary Metal Oxide Semiconductor (CMOS) is a tiny part of a motherboard where it stores its core configuration. If your system‘s IOS/CMOS is causing problems which cannot be changed manually, you can always reset it regardless of the Windows version you currently have installed in your PC- XP, Vista 7, 8,8.1 and Windows 10. This tutorial will show you how to reset your CMOS
To make sure your settings are retained, even if you unplug your computer, it is backed up by a small battery that is good for several years. That way, if anything happens to power, your BIOS settings are not affected.
A system called UEFI has replaced CMOS or BIOS since few years in newer computers.
UEFI’S ADVANTAGES OVER CMOS:
- Can store more information
- Supports larger hard drives
- Supports secure boot and many more drivers than bios
HOW TO CHECK IF YOU’RE USING CMOS/BIOS OR UEFI
You can check from within Windows and will take just a second with the following steps:
In the Windows Search box type, ‘Run’ and a pop up will appear with a search box in that type “msinfo32”.
- Select System Information.
- Select the System Summary tab in the left pane if it isn’t already.
- Look for BIOS mode in the right pane.
- If you see Legacy that means you’re using CMOS/BIOS. If you see UEFI, you’re not.
If you cannot boot into Windows to do the above then, follow the steps:
Open your PC case and look for a small CR2032 watch battery or a silver disk somewhere on the motherboard. If you find one, that’s the CMOS battery. If you don’t you are using probably using UEFI.
HOW TO RESET YOUR CMOS
If you have confirmed that you are using CMOS then you can reset it in two ways. If you made a change in your BIOS and cannot boot your computer or access it to manually change it, you can reset it using the battery else you can manually access the BIOS. Be aware that resetting your CMOS will reset all your BIOS settings back to factory defaults.
METHOD 1: USING THE BIOS
If your computer still boots normally you don’t have to open up your case and mess around with batteries or jumpers. The easiest way to reset your CMOS is to do it from there.
- Boot your computer
- Press F8 as soon as your keyboard light appears.
- Wait for the BIOS to load.
- Select ‘Load Factory Defaults’ and confirm your choice.
- Some computers require the Delete key instead of F8. Some motherboards will call the reset ‘Load Setup Defaults’, ‘Clear BIOS Settings’ or something else.
METHOD 2: CLEAR THE BATTERY
If you cannot get into your BIOS you can use this old school way of resetting a CMOS.
- Turn off your computer
- Open the case.
- Identify your CMOS battery.
- Use a small lever or screwdriver to remove the battery from its socket.
- Leave it for some minutes to use up the residual voltage.
- Replace the battery.
- When you boot your computer, you should see it boot straight into the BIOS.
- Now you can configure it as you need.
- If your CMOS battery is not removable, look for a CMOS jumper. This will be a tiny switch close to the battery and will be labeled something like CLEAR CMOS.
- Set the jumper to the clear position
- Power up the computer.
- Turn it off again and replace the jumper in its original position.