Question about MSI K8MM-V Motherboard

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Always start up with cmos checksum error, cpu ratio has been change

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A BIOS checksum error is most likely caused by a flat BIOS battery.
Replace the battery with a new one (it is usually a coin size battery - type CR2032) and then boot up and go to the BIOS configuration and set the Date & Time setting etc.

Posted on Jun 30, 2010

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Posted on Jan 02, 2017

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1 Answer

P4M900T-M2 Intel Pentium R dual CPU E2160 1.8 Ghz default BIOS Setting


The CMOS Checksum Bad Error during the pre-booting process only indicates that the CMOS battery is exhausted and it can not no longer save the current BIOS settings, Time settings and many more things.

The first and and the only way, according to me, to solve this problem is to replace the CMOS battery.

Please let us know, if this solution have helped you.

Hope this helps, Mrityunjay.

Jun 18, 2012 | EliteGroup ECS P4M900T-M2 Socket 775...

1 Answer

Getting a CMOS checksum bad error when starting my Acer M5640 Desktop with Windows 7 Thanks Daniel


Solutions to CMOS Checksum Bad Error

The CMOS Checksum Bad Error can be fixed easily by following the listed steps carefully.

CMOS Battery may not be functioning properly

If you suspect that your CMOS battery is not functioning properly, you can easily change it. Before changing your battery, reboot your computer to make sure that the error still exists. If it does, go into your CMOS and write down all of the settings. If all the settings are lost, you can usually retrieve them from your computer manufacturer. Now locate the battery and remove it, you might need to consult your computer's manual or technical support to remove your battery (the battery a flat, shiny silver colored and coin-shaped). Take down the CMOS battery's information such as volt, size, etc. Once you have your new battery, you can replace it and reenter your CMOS settings. If your battery was the cause of the CMOS Checksum Bad Error, you should have solved the problem.

Your BIOS may have been updated

If your BIOS have been updated recently, your CMOS settings may have reset. Make sure that the values entered in the BIOS are correct or simply reset them to the default settings. If you believe that a virus has updated your BIOS settings, run a virus scan and make sure that the BIOS settings are back to the default.

The Computer may not have been shut down properly

Sometimes when running MS Windows, if you shut down your computer without first properly shutting down your operating system, it will corrupt the CMOS settings causing the CMOS Checksum Bad Error. You can easily avoid this error by making sure that you completely shut down your computer properly before turning off the main power. Usually this entails going into the Start Menu, clicking on Turn Off Computer/ Shut Down. If improper shutdown was the cause of the error, you may have solved the issue.



akuma_ryu21 rate it pls!!

Jan 21, 2011 | Computers & Internet

1 Answer

AFTER SWITCHING ON, SCREEN STAYS FROZEN AFTER SAYING CMOS CHECKSUM ERROR- DEFAULTS LOADED


Hi there,

When starting your PC, the following error message is displayed:

CMOS wrong
CMOS MEMORY size WRONG
CMOS Checksum Bad
CMOS checksum error defaults loaded
Warning! CPU has been changed please re-enter cpu settings in the cmos setup and remember to save before quit!
You are prompted to:

Press F1 to resume
Press F2 to load default values and continue


This is due to the fact that the CMOS, which contain data related to the BIOS, has been reinitialized and that your PC has been reset to factory settings.

Solutions:

Reinitializing the BIOS
  • Change BIOS battery
    • If the problem persist this may be due to the fact that the battery powering the CMOS (when the computer is shut down allows the CMOS to store information), is depleted.
    • The CMOS battery is a small pin found on the mother board, you can refer to the manual provided with your motherboard to change it or have the nearby computer technician change it for you if you don't want to risk any damage.
    • More information with: Replacing the battery of your motherboard (CMOS battery)
Post back if it is not working we will be happy to help you.
Hope this helps.
Cheers!!!!

Jan 12, 2011 | Sharp Actius PC-RD10 PC Notebook

1 Answer

CMOS checksum bad


Check your battery connections sometimes when you change battery the connectors get distorted and do not connect properly.
Also check all M/board power conections

Nov 04, 2008 | EliteGroup P4M800PRO-M Motherboard

1 Answer

I'M TRYING TO SEARCH IN THE WEB BUT I CAN'T GET


Normally Checksum errors mean that the Battery on the board may not be holding a charge any longer. Best suggestion that I can give is to replace that battery. You can buy it in any electronics store. Just make sure to buy one with the EXACT same size. If that still does not work you may ahve to update your BIOS you can message me about that.

Sep 02, 2008 | Computers & Internet

1 Answer

CMOS checksum error


rahul23petit

"CMOS" checksum error default loaded" means ur mother board cmos battery fail (which is locate at mother board), to solve this problem replace it by new one (u can buy it form any computer accessories shop). all oher problem happen for it.

Jul 06, 2008 | EliteGroup BKi810 Motherboard

1 Answer

Problem with my BIOS CMOS Setting


Its due to your default CMOS setup does not match with your CPU configuration especially with CPU speed.
  1. To fixed the above problem goto BIOS and navigate settings of CPU, speed etc. Set the speed with the proper value as per manual. And save the settings.
  2. Infuture when you will load default, at that time also set the CPU settings.
  • The CMOS battery might not be connected properly or may be its not producing enough power as per needed by board. So have a look with another battery. Also clean the connection point of the CMOS battery.

Good Luck
Iqbal

Apr 22, 2008 | Biostar P4M80-M4 Motherboard

2 Answers

CMOS Checksum error - Defaults loaded


When the CPU speed stored in BIOS and the actuall speed of CPU differs then this error comes.

To fix this you have to select the actuall speed of your attached CPU to the board. Just set the actuall speed and save the changes. It will fix your problem.

Thanks
Iqbal

Mar 23, 2008 | EliteGroup P6STP-FL Motherboard

1 Answer

Cmos checksum error


cmos checksum errors are caused by a bad battery.
If that dont work then the board is bad from the factory.

Dec 24, 2007 | ASUS A8V-VM Motherboard

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