Question about ASUS P4P800 SE (890552603657) Motherboard

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CMOS Checksum Bad

I have ASUS P4P800 with error "CMOS Checksum Bad" and i already checked the battery and replace it with the new one, but the message still appear everytime i power on my PC.
How can i fix this?

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Re: CMOS Checksum Bad

Bios update might fix the problem

if da above link doesnt work check dis alternate link but i am sure it'll work

Posted on Nov 18, 2007

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P4P800 - VM BIOS Version 1012 to Upgrade 1018 Now CMOS can't save Date & Time

I'm sorry to have to say this but your CMOS battery connection is bad. There is basically nothing you can do other than replace the whole motherboard if it is too much of a problem.

One of my many computers is like this as well. I'm lucky in that as long as I leave that computer plugged in (it doesn't need to be turned on just plugged in), the CMOS won't reset its self. If you aren't that lucky then I would seek out a replacement motherboard.

Jun 18, 2012 | ASUS P4P800-VM Motherboard

1 Answer

ALIVEXFIRE-ESATA2 boots as far as win progress bar and blue screens. first time this happened i got an error message something like.. corrupt/bad checksum and bad cmos. ive had the pc about 3-5 years....

Bad checksum and bad cmos message signal that the chip in which the BIOS is stored has failed. This chip cannot be repaired or replaced, and since it's soldered on the motherboard it means that it is also dead.
Time for a new motherboard.

May 08, 2011 | ASUS Motherboards

2 Answers

Cmos checksum error defaults loaded

Make sure the battery your using is brand new. If it is then go ahead and get into the Bios and make sure the date and time is set properly. Once you do that then go ahead and save the changes and exit.

After this go ahead and see if the CMOS exit checksum defaults comes up if not then go ahead and turn off the computer and unplug it. Then after about 5 minutues plug the computer back up and turn it on and if the message doesn't come up then its resolved.

If the cmos checksum error comes back up then try a brand new battery, should be a 2032 battery and then go thru the same steps in setting the date and time and save changes and exit and if the message doesn't come back then unplug the system again and leave it unplugged for 5 minutes. Now plug it back up and if the message stays away the problem is resolved. it the message comes back then that means the motherboard isn't reconizing the batteries and the motherboard would need to be replaced.

Jun 29, 2009 | MSI KM4M-V Motherboard

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CMOS CHECKSUM BAD USB DEVICE OVER CURRENT STATUS DETECTED SYSTEM WILL SHUT DOWN IN 15 SECS there is no shortcircuit in usb header 5v is ok i also upgrade bios but it did not solve this error

easy......cmos checksum bad =

dead battery a new cmos battery for £2 ..make sure you install correct way up...

from any pc shop or ebay...

you will have to reset date /time in bios afterwards...f2 or delete usually to enter bios settings..
regards tonster

Apr 05, 2009 | ASUS P5RD2-VM Motherboard

2 Answers

Checksum error

Hi robynonis
Yes, definatly the cmos battery. Please make sure you replace with same type battery.
Regards Go-Tech

Dec 22, 2008 | ASUS P4PE Motherboard

4 Answers

Cmos checksum bad...usb current status detected system shut down 15 sec

Situation Remedies If you have encountered this error and would like to fix your computer, here are some remedies for each situation:
CMOS Battery Not Functioning Properly: If you suspect 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 settings are lost, you can usually get them from your computer manufacturer. Now locate the battery and remove it, you might need to consult your computers manual or tech support to remove your battery. Take down the CMOS batteries 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 remedied the problem.
Your BIOS has Been Updated (either by you or possibly a virus): If your BIOS has been updated recently, your CMOS settings may have become 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 updated your BIOS settings, run a virus scan and make sure that the BIOS settings are back to the default.
The Computer Was Shut Down Improperly: Sometimes when running MS Windows, if you shut down your laptop or desktop 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 before turning off the power. Usually this entails going into the Start Menu/ Turn Off Computer/ Shut Down. If you received the error, shut down the computer properly, if this is the cause of the error, the error message will not return.

May 11, 2008 | ASUS M2N-MX 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

5 Answers

Bad BIOS checksum.... CMOS bad checksum errors



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

Nov 15, 2007 | ASUS M2N-MX Motherboard

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