Question about Intel Motherboard

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CMOS/GPNU Checksum Bad 0085

Dear sir,
when I on the computer immediately before booting I am getting one display- at the end of the display- one error message as
CMOS/GPNU Chcksum Bad 0085
I do not know the meaning and what to do.
Will u pl help me?

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  • adrip Mar 15, 2008

    CMOS/GPNU checksum bad

    CMOS Date/Time not set

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  • 53 Answers

You may have a bad CMOS battery. Does it do this on restarts as well as cold boots.....if you only receive this message on cold boots, then you have a dead battery.

Posted on Nov 26, 2007

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Posted on Jan 02, 2017

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HP Compaq NC6000\r\nWhen I press the power button it seems to start but the only thing I see is numbers going by rapidly in the form of kbytes (524288 KB ok) then it reads 162-system Options not set. Then...


Hi promano67

When you "start" the computer, and the {"Screen"} displays a "Error Message."[CMOS] "error checksum!"

Settings: "Default" loaded.A "checksum error" shows that:

The ("Boot-up Settings "have been changed?"), ie. "Booting OS."

*Boot File 'missing'.

"This can 'occur' if the computer was "shut-down unexpectedly."

Force Shut-down : Power lost; due to 'low battery...'

A ("Power Surge") can cause this 'problem' also.

"What 'happens is that the [CMOS] settings are lost!".
"To fix the problem!"

Do the following:

  • "Restart / Boot the computer.

  • Next, verify if the 'error message' displays?

  • If you are still getting the message?

  • "You will have to "Remove the CMOS battery form the computer!"

  • Shut-down the computer.

  • "Unplug the computer from the {Wall Out-let}.

  • Remove the Lithium battery from the "Notebook."

  • There is a compartment (underneath) the "Notebook that 'store' the CMOS battery."

  • "You will need a {very small Phillips screwdriver}._953.jpg *Remove the CMOS battery for: [30 minutes].

  • !Important: If you have to do it again?

  • Remove the CMOS battery for a {'longer amount of time'}.

  • Replace the "CMOS battery."

  • Next, "Only plug the Power Adapter into the computer.

  • "Do not - replace the "Lithium battery!"

  • Once you have completed these 'task'.

  • "Restart the computer."

  • "Press the [F2] key, to 'enter' the CMOS / BIOS Setup!" _951.jpg

  • Next, 'reset' (all) "Values to the Default Settings."

  • "Press the [F10] key to 'Save' the changes!"

!Important: "Take a 'moment to rate the help', so I can get 'credit' for the work.

Thank you!" - paul7of9







Mar 13, 2011 | HP Compaq nc6000 Notebook

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Computer will not boot past POST and it shows "CMOS checksum error - defaults loaded" on the screen...


good day,

your cmos battery is weak(low voltage) it does not save your bios settings every time you configure it or set it to default settings, it will always display cmos error every time you shutdown your PC, try replacing it with a new one, check the old battery model and buy it in your nearest computer shop, commonly used battery in Motherboards is CR2032 Lithium battery..

Hope this helps.

Sir MArkus

Feb 01, 2011 | Computers & Internet

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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

Booting problem


There are usually three main reasons that a CMOS Checksum Bad Error has occurred. They include:
  • CMOS Battery may not be functioning properly. The battery life may have expired.
  • Your BIOS may have been updated (either by user or possibly a virus)
  • The computer may not have been shut down properly e.g. shutting off the computer's main power without first shutting down the computer (MS Windows requires you to shut down your computer before shutting off the power).
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

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CMOS Error


Are the CMOS batteries good?

Oct 15, 2008 | Biostar P4M80-M4 Motherboard

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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

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CMOS checksum bad 0085


the problem might lie in the fact that the mother board and cpu cannot be handled at the speed

or it requires the jumpers to be set by so that the cpu can be clocked properly if you got a mother board spec guide follow the guide for *********** board to set up 3.2

you might also have to set the bios to the cpu speed cause if mother board doesnt do jumpers no more the setting would be in bios
hit the delete key direct are power up this will take you to bios
its not the battery

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If your CMOS batt is ok, then try flashing your BIOS

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I just had the CMOS checksum error while starting the computer, So pressed F1 and continued.. I just don't think it's the battery, because the computer is 2-3 months old, and all parts were new. I also have another problem. which is that it tells me at start upo the the IDE 80 connector cable isn't installed, or something like that, which prevents one of my hard drives to be found by windows....

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Bad BIOS checksum.... CMOS bad checksum errors


BOOT BLOCK COMPATIBLE VERSION VER .005
BAD BIOS CHECKSUM

CHECKING FOR CD ROM
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
NO CD-ROM FOUND
CHECKING FOR FLOPPY DISK
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
NO FLOPPY DISK FOUND

Does someone already fix this problem??????

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