How To Clear Cmos: Complete Guide And Step-By-Step Instructions

  • 4 min read
  • Jul 09, 2023
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Greetings, Ihsanpedia Friends!

Welcome to another informative article brought to you by Ihsanpedia. In today’s digital era, technology plays a crucial role in our lives. However, sometimes even the most advanced systems encounter issues that require troubleshooting. One common problem that computer users face is a corrupted or misconfigured CMOS (Complementary Metal-Oxide-Semiconductor) settings. In this article, we will guide you through the process of clearing CMOS, providing you with step-by-step instructions and valuable insights.


CMOS is a small battery-powered chip located on the motherboard of a computer. It stores essential hardware settings and system configuration information. Clearing CMOS is a procedure used to reset these settings to their default values. This process can be helpful in resolving various issues, such as system instability, boot failures, and compatibility problems.

Before we delve into the details of how to clear CMOS, it is essential to understand the advantages and disadvantages of performing this procedure.

Advantages of Clearing CMOS

1. Resolving Hardware Compatibility Issues: Clearing CMOS can help resolve hardware compatibility problems, especially when installing new components or peripherals. By resetting the CMOS settings, any conflicts or inconsistencies can be eliminated.

2. Fixing Boot Failures: If your computer is experiencing boot failures or repeatedly restarting, clearing CMOS can often provide a solution. By restoring the default settings, you can eliminate any misconfigurations that may be causing the issue.

3. Overcoming System Instability: If your system is unstable, experiencing frequent crashes, or freezing, clearing CMOS can help. It resets the BIOS (Basic Input/Output System) settings, potentially resolving any instability issues.

4. Password Removal: In some cases, clearing CMOS can also remove BIOS passwords. This can be beneficial if you have forgotten your password and cannot access your computer.

5. Resetting Overclocking Settings: If you have overclocked your system and are facing stability issues, clearing CMOS can reset the overclocking settings to their default values, helping resolve any problems.

Disadvantages of Clearing CMOS

1. Loss of Customized Settings: Clearing CMOS resets all the settings to their default values, which means any customized configurations, such as boot order or fan settings, will be lost. You will need to reconfigure these settings after clearing CMOS.

2. Time-consuming Process: Clearing CMOS is not a quick fix. It involves several steps, and you may need to open up your computer and locate the CMOS battery on the motherboard. This process requires caution and patience.

3. Potential Risks: Clearing CMOS is generally safe, but there is a slight risk of damaging the motherboard or other components if not done correctly. It is crucial to follow the instructions precisely and handle the hardware with care.

4. Compatibility Limitations: Clearing CMOS may not resolve all hardware or software compatibility issues. In some cases, you may need to seek alternative solutions or consult with a professional.

Step-by-Step Guide: How to Clear CMOS

Before you proceed with clearing CMOS, it is essential to gather the necessary tools and prepare yourself for the process. Here is a comprehensive step-by-step guide:

Step Instructions
Step 1 Power off your computer and unplug it from the power source.
Step 2 Open your computer case by removing the screws or latches.
Step 3 Locate the CMOS battery on the motherboard. It is usually a round, silver battery.
Step 4 Use a small, non-metallic tool, such as a plastic tweezer or a flathead screwdriver, to gently remove the CMOS battery.
Step 5 Wait for approximately 5-10 minutes to ensure that the CMOS memory is completely cleared.
Step 6 Reinsert the CMOS battery back into its socket.
Step 7 Close your computer case and secure it with the screws or latches.
Step 8 Plug your computer back into the power source and power it on.
Step 9 Enter the BIOS setup by pressing the designated key during the boot process (e.g., F2 or Del).
Step 10 Reconfigure your desired settings, such as boot order or date and time.
Step 11 Save your changes and exit the BIOS setup.
Step 12 Allow your computer to boot into the operating system.
Step 13 You have successfully cleared CMOS!

Frequently Asked Questions (FAQ)

1. Can clearing CMOS delete my personal files?

No, clearing CMOS does not affect your personal files. It only resets the hardware settings and configurations stored in the CMOS chip.

2. Will clearing CMOS remove my operating system?

No, clearing CMOS does not remove your operating system. It only resets the BIOS settings to their default values.

3. Do I need to clear CMOS if I update my BIOS?

Typically, updating your BIOS does not require clearing CMOS. However, in some cases, it may be recommended to clear CMOS after a BIOS update to ensure optimal compatibility and stability.

4. Can I clear CMOS without opening my computer case?

In most cases, clearing CMOS requires accessing the motherboard and removing the CMOS battery. Therefore, you would need to open your computer case.

5. Will clearing CMOS solve all my computer issues?

No, clearing CMOS is not a universal solution for all computer issues. While it can resolve certain problems, more complex issues may require additional troubleshooting or professional assistance.

6. How often should I clear CMOS?

Clearing CMOS is typically only necessary when you encounter specific issues. There is no need to clear CMOS regularly unless instructed by a professional or when troubleshooting a problem.

7. Can I clear CMOS on a laptop?

Clearing CMOS on a laptop is generally more challenging than on a desktop computer. It often requires disassembling the laptop and locating the CMOS battery, which may not be easily accessible.


Congratulations! You have now learned how to clear CMOS and the advantages and disadvantages associated with this procedure. Remember, clearing CMOS can be a useful troubleshooting step in resolving various hardware and system configuration issues. However, it is essential to approach the process with caution and follow the instructions precisely to avoid any potential risks. If you encounter any difficulties or are unsure, it is always recommended to seek professional assistance.

Now that you have acquired this valuable knowledge, we encourage you to take action and confidently tackle any CMOS-related problems you may encounter. By following the step-by-step guide and understanding the potential risks, you can effectively resolve issues and optimize the performance of your computer system.

Thank you for reading our comprehensive guide on how to clear CMOS. We hope you found it informative and helpful. Stay tuned for more technology-related articles and tutorials from Ihsanpedia!


Q1: Is clearing CMOS the same as resetting BIOS?

A1: Clearing CMOS and resetting BIOS refer to the same process. Clearing CMOS resets the BIOS settings to their default values.

Q2: Can clearing CMOS damage my computer?

A2: While clearing CMOS is generally safe, there is a slight risk of damaging the motherboard or other components if not done correctly. It is crucial to follow the instructions precisely and handle the hardware with care.

Q3: Can I clear CMOS by removing the power cord?

A3: No, simply removing the power cord does not clear CMOS. You need to remove the CMOS battery from the motherboard to reset the settings.

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