Question about ASUS P4XP-X Motherboard

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BIOS I had problem with my mobo, every time i unplug power cable than pluged again, booting always showing "CMOS checksum error-default loaded", i had try update the BIOS version but that always happen agaian.. Help me Please... thank's for your guide ardy_sella@yahoo.com

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  • rhome2704 Feb 08, 2008

    Thank's for comment, sorry i'm forget to confirm that i had try change the battery and the memory to.., but didn't yet check the integrity of the bios hard component on my mainboard (for scraches,signes of colizion).

    Anyway if you have other experince with this mobo, please share with me...
    with fully regards thank's for solution...

    rhome2704

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Have you tried a bios reset instead?try a full reset by getting out the battery and by switching the jumper (all this disconected from the power)-do this with the ramm dims out of the slots also.sometimes this use.
try also to replace the battery and after that rewrite the bos by doing this from a bootable cd under dos mode.DO NOT use the aplication to flash or to update the bios under windows.
this might damage the bios.
check also the integrity of the bios hard component on your mainboard(look for scraches,signes of colizion)
check the bios data..you may have something wrong set
good luck
inform me of your doing..bye

Posted on Feb 07, 2008

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Ok all right you can try  bios update . change cmos battery 1st.
then restart pc .

Posted on Feb 07, 2008

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Cmos checksum bad boots to the splash screen then goes black with a blinking white line tried reseting the jumper cmos no luck load default settings no luck removed psu and battery no luck


This error is not the same as a CMOS Checksum Error, which refers to corrupted values of the CMOS settings, the ones you set through the BIOS setup program. This error means the contents of the BIOS code itself are damaged.


During the boot process you will see on the screen a certain key to press to enter setup
Press and hold that key during the boot up process to enter BIOS you can load failsafe defaults or load optimized defaults ,press escape then press f10 to save to cmos to restart
You will also need to set the time and date

In the main or system setup screen you should be able to see the date and time Using your arrow keys navigate to the date and change the date. Once highlighted on the month, day, or year, press your arrow keys or your page up / page down keys to change the date.

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Oct 08, 2011 | EliteGroup ECS Socket Micro ATX...

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Hello, when I put my pc running it says CMOS checksum error press F1 to enter or Del to enter setup, but I press Del when I save changes "save and exit" the computer restarts, but this time...


The Checksum error basically shows that boot settings which were previously set has been changed or reset. This usually happens when the battery loses its charge and thus fail to retain the CMOS settings. This can also be caused by a power surge or a damaged motherboard. But most of the times it would be the battery problem.

You can try replacing the CMOS battery and enter the values back into CMOS or reset values to default. Then switch off and boot up again.
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I have a Soya SY-7VCA mobo that hasn't been used for about 6 years. Upon bootup, I received a CMOS checksum error message, but was still able to load a copy of Windows 98SE that I had on floppy. After...


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WHEN BOOTING IT ALways stops with notice "Checksum Error"


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Ref GA-81PE1000L Error message on boot up


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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.

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1 Answer

Boots to 'CMOSS checksum error'


CMOS checksum errors
Explanation: A checksum is computed as an error-detecting code, to protect the BIOSsettings stored in the CMOS memory.Each time the system is booted this number is recomputed and checked against the storedvalue. If they do not match, an error message is generated to tell you that the CMOSmemory contents may have been corrupted and therefore some settings may be wrong. BIOSesreact in different ways to encountering this sort of error. Some will warn the user andthen continue on with whatever settings were in the CMOS. Others will assume that thesettings that were in the CMOS were corrupted and will load default values stored in theBIOS chip "for safety reasons". The error message will indicate which yoursystem is doing.
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You should make sure that all of theBIOS settings in the system are correct, by rebooting the system, going into BIOS setupand double-checking all the values (hopefully against a recent BIOS settings backup).
If you have created a backupcopy of your CMOS settings then use them to restore the settings to the correctvalues. To find the problem itself:

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1 Answer

Cmos checksum error after flashing the bios


I had a similar experience after upgrading my RAM. When you reset your CMOS and have default settings maybe you should check if your RAM timings are correct. I could not get mine to load with both sticks in until I fixed the timings from the default settings.

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