How to clear the CMOS

Here are is the basic procedure to clearing your CMOS.

Clear CMOS

It is important to understand that clearing the CMOS will:
-Restore BIOS’s default settings.

It is important to understand that clearing the CMOS will not:
-Restore the original BIOS code (will not revert back to the original bios version).

Old CMOS clearing method

Step 1:
Disconnect the main AC power by either shutting off the power button on the back of your power supply or simply pulling out the power cable.

Step2:
Wait a minute to be sure all the capacitors and coils have discharged.
To be really safe you can press the power button which will drain the capacitors for sure.

Step3:
Move the CMOS jumper to the clear position, this is usually done on MSI boards by moving JBAT1 from it’s original 1-2 position to 2-3 position as demonstrated in the photo below.

If you are not sure or have a non MSI board you must find the correct jumper in your motherboard manual.

*Note to all nForce2 users, your board usually has a special “safe mode” jumper for the FSB. You should also set it to the safe setting in case you have been overclocking since the normal clear CMOS jumper will not reset the frequency settings on these boards. You may refer to your user manual.

Step4:
Wait a minute to be sure the CMOS has been cleared.

Step 5:
Return the CMOS jumper to it’s original position.

Step6:
Restore power to the system.


New CMOS clearing method

Step 1:
Disconnect the main AC power by either shutting off the power button on the back of your power supply or simply pulling out the power cable.

Step2:
Wait a minute to be sure all the capacitors and coils have discharged.
To be really safe you can press the power button which will drain the capacitors for sure.

Step3:
Press the clear CMOS button on the back of the I/O panel.

Step4:
Wait a minute to be sure the CMOS has been cleared.

Note: It is also recommended to remove CMOS battery to ensure 100% CMOS clear on Big Bang X & Intel 6x Sandy Bridge MB’s. If date/time do not revert to original time of MB manufacture then you didn’t get a complete clear CMOS.

Step5:
Restore power to the system.


Resources:

  • www.msi.com

Leave a Reply

Your email address will not be published. Required fields are marked *