Question about Biostar P4M80-M4 Motherboard

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CMOS Error Every time when i boot my computer i get this type of error as follow CMOS Checksum Error - Default loaded I keep on getting checksum error each time I boot my system with biostar motherboard. Pls can somebody help for solution?

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  • 41 Answers

Are the CMOS batteries good?

Posted on Oct 15, 2008

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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

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.

hope this helps you

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

2 Answers

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.
Hope this works. Good Luck. ~SmokinJoe~

Apr 28, 2011 | EliteGroup KM400-M2 Motherboard

2 Answers

WHEN BOOTING IT ALways stops with notice "Checksum Error"


replace the cmos battery into new one that is specified the exact volt..hope this helpful...

Oct 25, 2009 | Abit KR7A-133R Motherboard

1 Answer

Ref GA-81PE1000L Error message on boot up


all the computer bios settings are stored even when the computer is off (like time and fsb)

these are stored due to the help of a cmos battery

when this battery finishes it gives the CMOS Checksum error Default loaded error

all you need to do is replace the cmos cell

it is a mercury cell (looks like a silver coin) and will be placed on your motherboard

it is very very cheap so go buy one and replace it and be happy

Sep 30, 2009 | Intel Motherboard

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.
Diagnosis: The most common cause of checksum errors in CMOS is a battery that islosing power. Viruses can also affect CMOS settings, and motherboard problems can alsoaffect the stored values.
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:

Apr 06, 2009 | Intel Motherboard

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

6 Answers

CMOS Error


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

Jan 24, 2008 | Mercury P4VM800M7 Motherboard

1 Answer

Cmos error


ok, a checksum error can refer to a flat cr2032 cmos battery, especially if the time is wrong at every boot.

May 26, 2007 | Intel SuperMicro SUPER Motherboard - 810...

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