Remettre à zéro le Bios (clear cmos)

Introduction

This tutorial will guide you through the process of resetting your BIOS (Basic Input/Output System) or clearing the CMOS (Complementary Metal-Oxide-Semiconductor). If you've made numerous changes to your BIOS settings, causing instability or malfunction, resetting it can restore your system to a stable state.

Step 1: Remove the Motherboard Battery

Removing the battery from your motherboard is one of the most common methods to clear the CMOS.

Instructions:

1. Power Down Your Computer: Ensure your computer is completely turned off and unplugged.
2. Open the Case: Use a screwdriver to remove the side panel of your computer case.
3. Locate the Battery: Look for a round, silver battery on your motherboard (similar to a coin).
4. Remove the Battery: Gently pry the battery out of its socket. Be careful not to damage the motherboard.
5. Wait: Leave the battery out for about 5-10 minutes. This allows the CMOS memory to clear.
6. Reinsert the Battery: Place the battery back in its socket, ensuring it is seated properly.
7. Close the Case: Reattach the side panel of your computer case.

Step 2: Use the CMOS Jumper

Many motherboards come with a jumper that can be used to reset the BIOS settings.

Instructions:

1. Power Down Your Computer: Make sure the computer is off and unplugged.
2. Open the Case: Remove the side panel of the computer case.
3. Locate the Jumper: Find the CMOS jumper on your motherboard. It is usually near the battery and may be labeled as "CLR_CMOS," "CLEAR," or similar.
4. Change the Jumper Position:
   • If it’s covering pins 1 and 2, move it to cover pins 2 and 3.
   • Wait for about 5-10 seconds.
   • Move the jumper back to its original position.
5. Close the Case: Reattach the side panel of your computer case.

Step 3: Restore BIOS Settings from Within BIOS

If you can still access the BIOS setup, you can reset it directly through the BIOS interface.

Instructions:

1. Power On Your Computer: Turn on your computer and press the appropriate key to enter the BIOS setup (often DEL, F2, or ESC).
2. Navigate to Default Settings: Look for an option that says "Load Optimized Defaults" or "Restore Defaults." This may vary by manufacturer.
3. Confirm the Action: Select the option and confirm that you want to restore default settings.
4. Save Changes and Exit: Make sure to save your changes before exiting the BIOS.

Conclusion

Resetting your BIOS can resolve issues caused by incorrect settings or instability. You can achieve this through three primary methods: removing the motherboard battery, using the CMOS jumper, or restoring settings from within the BIOS. Choose the method that best suits your needs, and remember to handle all components with care to avoid damage. If you encounter further issues, consider seeking professional assistance or exploring detailed BIOS/UEFI training resources.