Question about Mercury P4VM800M7 Motherboard

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Cmos error checsum error every time i on my pc.its irritating ,plse hlp.

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Change ur cmos battery n reset ur cmos settings in cmos setup.click f10 to apply settings n restart ur machine.
feel free 4 further assistance .rate the particular experts solution as fixya that helps u understand n solve ur problem

Posted on Jul 01, 2008

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2 Answers

I have an intel g41 motherboard....every time i switchon d pc...it shows check cmos error and the time and date are set to defaluts


This error occurs when the BIOS battery is flat. Replace the BIOS battery, most motherboards use a lithium battery type CR2032, this is a coin size battery. Check the BIOS battery type used on your motherboard before you purchase the battery.
After replacing the battery go to the BIOS setting and set the Date & Time etc. and you will not have this CMOS error.

Aug 10, 2011 | Intel Motherboard

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

1 Answer

Every time i starts my pc it shows cmos setting error,date and time not set.when i replaces cmos bsttery with newono then also it shows the same


Hello prad3010:
First be sure the replacement battery is a known good one. I have had bad new batteries before.
After starting up go into your bios and reset to default values and accept the changes.
When it reboots cmos error should go away.
Also make sure that the jumper on the pins to clear the cmos settings is in the run position.
Her is the site for your manual:

http://www.pcchipsusa.com/PCCWebSite/Downloads/ProductsDetail_Download.aspx?detailid=56&DetailName=Manual&DetailDesc=&CategoryID=1&MenuID=6&LanID=2

If this helps be sure to vote.

Jan 13, 2011 | PC Chips M756LMRT+ PII/III/Celeron...

2 Answers

Came home computer was on black screen and now it won't reboot. When I try to reboot, I get a "cmos checksum error ". Keyboard also isn't working. What could be the problem?


The CMOS checksum error occurs when the CMOS battery is worn out and the CMOS data gets corrupted. Replace the CMOS battery, this battery most likely a CR2032 lithium coin size button battery - check to make sure before you purchase.
After replacing with a new battery, then go to the BIOS configuration and set the Time & Date etc.

Sep 02, 2010 | Gigabyte 7VM400M-RZ (GA-7VM400M-RZ)...

3 Answers

Cmos checksome error


I don't know what kind of unit you are useing.
You need to watch the screen when it boots up.
It will say check sum error, press ? F-2 to continue or F-1 to enter setup.??
Enter the setup screen and change the date and time.
Save ? F-10 and exit.
I hope this has helped you.

Oct 05, 2009 | Intel D102GGC2 Motherboard

1 Answer

Computer freez


well u could try going into ur bios befor it freezes and make it boot from the win98 cd instead of ur HDD or use a boot disk or just take ur cmos battery out and it will reset ur bios so it should work

Jan 13, 2009 | Motherboards

1 Answer

Im getting a boot time error called CMOS error and then i have to enter the sytem date and time every time i start the pc. After that it shows me an error like Invalid System Disk. wht does tht mean?


The CMOS error is caused by a dead motherboard battery. There is a small battery on the motherboard Usually a 2032 battery. The dead motherboard battery could also cause the Invalid system disk because a dead motherboard battery will also cause the motherboard to lose the Hard drive settings.

Nov 12, 2008 | Toshiba 4030CDT (P000271450) 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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