Question about Mercury P4VM800M7 Motherboard

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I've replaced the battery but checksum error still occurs and F1 is suggested to press for setting time and date

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Hi, try this link it has usfull information and help, your problem may well be that your BIOS needs resetting back to default:
http://www.tech-faq.com/cmos-checksum-bad-error.html

Posted on Aug 03, 2010

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I used jumper bios reset and now gettin bad checksum error. on the mother board writen that K8N rev 1.01 i downloaded k8n motherboard rom file and renamed as k8n.rom and copied to disket. its deleting and...


Hi.

The most probable reason you are getting the bad checksum error is you have to set the date and time because you have cleared the CMOS and reset the BIOS.
You should also get a message that says press F1 to load defaults or press a certain key to access setup. Access setup (BIOS) and set the date and time. That should take care of the bad checksum error.
Another good idea is make sure the motherboard battery is not dead either.



Regards.

Jun 17, 2011 | ASUS Computers & Internet

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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.
Hope this works. Good Luck. ~SmokinJoe~

Apr 28, 2011 | EliteGroup KM400-M2 Motherboard

1 Answer

When i boot my system iam getting an error Check Date and Time settings and System CMOS Checksum Bad and Default configuration is used. F1 : Resume F2 :- Setup


Hi Good day!! That error maybe cause of your CMOS battery it may be not working, replace your CMOS Battery (2032 3volts), after you replace it with new one, set your date and time setting according in your time zone.

Oct 13, 2010 | Computers & Internet

4 Answers

Start up snag


This is the problem with your "Bios Battery" which on the motherboard. Maybe there's none or it's not functioning anymore. Just replace it and the "cmos checksum bad" error message will go.. for your reference, i include some pictures.. herein. 0748746.jpg
3ea86c8.jpg

Good luck.

May 25, 2010 | E-Machines eMachines Desktop PC

3 Answers

How to solve CMOS checksum and timer errors?


Hello,

Your backup battery is to weak to save the cmos data. Open your computer case and look for a round silver battery that looks like a quarter. Remove it and go to Radio Shack or a drug store battery section and get a replacement. The battery number is probably CR2032 but may be CR2025 or CR2016. insert the new battery and power up your computer, this time when you set the time and date the settings will stay when you turn it off.

I hope this helps, If so please rate our solution.

Buddy
Corporate Computer
www.ccl-la.com

Sep 12, 2009 | Intel D945GCZ Motherboard

2 Answers

I get the message "Bad check sum (CMOS)" Model toshiba tecra 730XCDT


hi friend,

Probably a dead Motherboard battery. Need to enter the BIOS screens and reset values. Especially the time and date. Maybe the boot order and if using USB KBoard enable legusy USB devices. This will occur each time your friend shuts down and reboots until the battery is changed.
Issue
When you turn your Toshiba computer on, you see an error message like: **** Bad RTC battery ****
**** Bad Checksum (CMOS) ****
Check system, then press [F1] key The Real Time Clock (RTC) battery provides power for the internal clock/calendar and for maintaining system configuration settings.
This error can occur when a machine has been left turned-off for an extended period of time (around a month), and is the result of a depleted RTC battery. Other symptoms include not being able to execute Windows Update properly, errors/problems executing application software (like Norton Antivirus), and the appearance of the Windows XP "Desktop Clean Wizard".
Resolution This condition is easy to fix in 3 basic steps: Reset the BIOS defaults
Set the correct date and time in Windows.
Charge the RTC battery Please follow the detailed instructions in the next section.
Procedure Set BIOS defaults Press the [F1] key as instructed in the error message:
**** Bad RTC battery ****
**** Bad Checksum (CMOS) ****
Check system, then press [F1] key In the BIOS setup screen press the [Home] key to restore the default values, then press the [End] key to save and exit, then the [Y] key to confirm and restart the system. Set the correct date and time in Windows As Windows starts-up, you may see an error message about an "Invalid System Time". Go ahead and click "OK" to clear the error dialog. Open the Windows Control Panel and open the "Date and Time" control by double-clicking its icon. Set the correct date and time, then click OK to save. Charge the Real Time Clock (RTC) battery To charge the RTC battery, connect the AC adapter and turn the computer on (both the DC IN and Power LEDs must be green). Leave the machine on for approximately 24 hours to ensure a full charge in the RTC battery. Please note that the RTC battery does not charge while the PC is turned off, regardless of whether the AC adapter is connected or not. Other Information: If, on subsequent reboots, the "Bad RTC Battery" error persists, it's quite likely that you actually do have a bad RTC battery. If that's the case, you should contact a Toshiba Authorized Service Provider to have the system serviced. Windows XP Desktop Cleanup Wizard The first time you reboot Windows XP after resetting the system clock, Windows XP may try to run the "Desktop Cleanup Wizard". Simply Cancel the "Desktop Cleanup Wizard" at the first dialog. If you do manage to clean your shortcuts from the desktop and want to recover them, you will find them in a folder called "Unused Desktop Shortcuts". You can recover them as follows: Double-click to open the "Unused Desktop Shortcuts" folder
Click to expand the "Edit" menu, and click "Select All"
Drag the selected items back to your desktop
Close the "Unused Desktop Shortcuts" folder. You can delete this folder if it is empty.

thank u for using fixya

regards,
sivaranjini

Aug 10, 2009 | Toshiba Tecra 730CDT Notebook

2 Answers

Intel 102ggc:The Firmware has detected that Cmos Checksum Error


Hi there.
Basically you first bios update was bad, if you can get into the operating system re-flash the bios again, that will sort it out.

Good luck and thanks for choosing FixYa!!

Jun 02, 2009 | Microsoft Windows XP Professional Upgrade...

3 Answers

Turn on computer and message reads ****bad check sum (CMOS) ****


That means that after computer had been off for a long time the CMOS battery has drained, and CMOS (BIOS) settings had been reset to default.

Usually the computer will work fine after pressing F1, but you may get wrong date and time.

Try charging battery completely, often the problem disappears, if it does not , then the choice is between pressing F1 each time you start the laptop, or disassembling the laptop and replacing CMOS internal coin battery, located on the lower side of the motherboard.

May 17, 2009 | Toshiba Satellite 1805-S204 Notebook

1 Answer

**** RTC battery is low or CMOS checksum is inconsistent **** Press [F1] to set Date/Time


Hello

Please reset cmos to factory defaults.
Then enter the bios setup and configure it and save changes.

Apr 20, 2009 | Computers & Internet

1 Answer

CMOS Checksum error.


the only thing i can think of is when you changed the battery somehow the board terminals positive negative are not in proper contact with battery
did you try resetting bios by the pins on the motherboard
somewhere on the board is printed bios reset or words to the effect
most times it is a 2 pin connector with a jumper only on 1 pin connect the jumper across both pins remove and try to reboot
hope this helps

Jul 14, 2008 | ASUS M2N-VM DVI - Motherboard - micro ATX...

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