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Author Topic: How to clear the CMOS  (Read 352684 times)

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Svet

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How to clear the CMOS
« on: 18-October-03, 23:41:59 »

Here are is the basic procedure to clearing your 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.
« Last Edit: 23-October-11, 12:26:28 by Henry »
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penllyn

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« Reply #1 on: 05-December-03, 14:31:31 »

Many thanks. Will try this tonight. Let you know how I get on!
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SantaClaw

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« Reply #2 on: 08-December-03, 13:57:57 »

:idea:

Also I wold like to add, on the K7N2 Delta, resetting the bios will NOT reset the bus/fsb to default, so if you were unfortunate like me, and overclocked the FSB to high, and the computer refuses to boot, you need to move another jumper, that enables the motherboard's  "Safe Mode" :-D).

I belived that my mother board was broken/faulty and was about to RMA it, since I coldnt find a reffrence to this jumper in the manual that shipped out with my board  :angryfire: :angryfire: :angryfire:..

After three long days with a dead motherboard, I had done just about everything i could think off..

I only found the solution by chanse when I read a Review of the mother board....

Iv'e later seen others here on the forum with the same problem.

Some actually RAM'ed their motherboard....

This is the J10jumper, wich wil set the fsb to 100 mgz when in safe mode.. short pins 2-3 and "user settings"(default) if you short pins 1-2.

The "safe mode" jumper is placed just behind the USB connectors on the mother board.
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sportster00

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« Reply #3 on: 17-December-03, 08:14:25 »

Hello,

i have a suggestion to add to your guidelines for clearing CMOS.
Usually after i update my bios, i would go into bios setup and enable 'clear nvram'
option, it work for me. I wonder if anyone notice this option ?
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Birch

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« Reply #4 on: 14-April-04, 08:00:35 »

Why would one want to clear their CMOS?

I was thinking of doing it because I wanted to reset my BIOS back to the factory settings.  But it doesn't work that way (so I read from above).
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bluearchtop

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« Reply #5 on: 14-April-04, 15:33:33 »

Is there a J10 Safe Mode jumpter on the Neo2 865PE?
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Wonkanoby

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« Reply #6 on: 14-April-04, 15:36:00 »

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