Question about Acer VM670G-UQ9550C model Veriton M670G-UQ9550C Micro tower, Intel Core 2 Quad Q9550 / 2.83 GHz Type, Quad-Core Multi-Core Technology, L2 cache Cache Memory, 4 GB RAM, DDR3 SDRAM Technology, 1066 MHz Memory Speed, DIMM 240-pin Form Factor, Serial ATA-300

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CMOS Checksum bad - BIOS won't save

After I flashed BIOS with WinDPtool that was in the BIOS folder, I restarted the computer, then I got this error: CMOS Checksum bad - Press f1 to run setup. I bought new CMOS Batteries to my computer and replaced it with the old one, but it doesnt seem to work. The BIOS wont save when I choose "No errors" on Halt on in BIOS CMOS Features... so, my questin is kinda gently; how do i fix it? :)

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  • Acer Master
  • 3,606 Answers

Helllo you have maybe flashed the bios with a wrong one.

The acer homepage is here:

http://support.acer.com/product/default.aspx?modelId=481

ALWAYS download bios upgrade at the computers homepage !!!!

You need to contact the acer support in your country
they can help you with that.

Good luck

Posted on Oct 28, 2012

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Posted on Jan 02, 2017

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1 Answer

Main Bios Checksum Error!!!


Take notes of the BIOS settings of your computer for use after replacing the CMOS battery.

To access the computer's BIOS, restart your computer and press the "F 10" function key during the restarting process.


The BIOS configuration panel will then open and you can write the specific settings for your computer down to use for BIOS configuration after replacing the battery.


Turn off your computer and remove the power cable and if installed, battery.

Remove the computer hatch which will vary in method depending on the brand and model of computer you have.


On some motherboards cmos batteries are soldered in


Locate the CMOS battery on the motherboard.

The more popular model of CMOS battery used is annotated with a CR2032 label and is a round shaped button.


Firmly remove the CMOS battery from the motherboard.

Align the new CMOS battery with the positive side orientated towards you and insert into the mother board.


Restore the power cables to your computer and restart the PC.

During the restarting process, depress the "F10" function key to enter the BIOS setup screen.


Update the date in the BIOS and change the BIOS settings to match those you recorded in step one.


After the settings are updated, select the "Save and Quit" menu option and restart your computer to finish the CMOS battery replacement.


hope this helps




Sep 23, 2012 | Computers & Internet

1 Answer

Shuttle xp, ntldr is missing


replace the cmos battery, reboot the computer go into bios reset date and time and change boot order cdrom to boot first save changes. boot from windows xp cd do a repair. form command type sfc /scannow checks all system files.if any are bad should repair them.

Apr 17, 2017 | Computers & Internet

3 Answers

CMOS error


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.

Diagnosis: The BIOS ROM chip on the motherboard is probably faulty. It could also be another component on the motherboard.

You should make sure that all of the BIOS settings in the system are correct, by rebooting the system, going into BIOS setup and double-checking all the values (hopefully against a recent hardware or software change


If you have reset the CMOS memory you need to go into the BIOS setup screen and reconfigure the BIOS. To do that you need to press a key while the computer is booting. Usually F2 but can be other keys. It should tell you on the bottom of the first screen which key to press to enter BIOS setup.

If you don't know the settings you should be one for optimal defaults - use that one. You will also need to reset 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.

Save, Exit and re-boot and everything should then work.

During the boot process you will see on the screen to press delete to enter setup
Press and hold delete 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

hope this helps you

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1 Answer

Cmos checksum erroe defaults loaded


press del to enter setup.then choose default bios setup. then save and exit.pc will restart.

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Compaq Presario 2500 stopped loading windows XP with a prompt STOP: c0000221 {bad Image Checksum} The image COMCTL32.dll is possibly corrupt. The header checksum does not match the computed checksum.


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 to press delete to enter setup
Press and hold delete 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
click start control panel date and time you can make your adjustments to the date and time from there also right click on the date and time on the bottom toolbar (bottom of screen) you should see Adjust date and time tab
hope this helps you

Sep 09, 2011 | Compaq Presario 2100 and 2500 ,NX 9000...

1 Answer

Mainboard GA-G31-ES2C Warning: Backup BIOS checksum error BIOS Auto-Recovering...


If you have reset the CMOS memory you need to go into the BIOS setup screen and reconfigure the BIOS. To do that you need to press a key while the computer is booting. Usually F2 but can be other keys. It should tell you on the bottom of the first screen which key to press to enter BIOS setup.
If you don't know the settings the should be one for optimal defaults - use that one. You will also need to reset the time and date.
Save, Exit and re-boot and everything should then work.
During the boot process you will see on the screen to press delete to enter setup

Jul 23, 2011 | Gigabyte GA-G31M-ES2L Motherboard

2 Answers

BAD BIOS CHECKSUM, STARTING BIOS RECOVERY...


I have seen this be a CMOS battery many times. Also, you can try flashing the BIOS if you continue to have troubles after replacing the battery. You should be able to find that information on the motherboard manufacturer's website.

May 05, 2011 | Computers & Internet

1 Answer

Cmos checksum bad


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.

Diagnosis: The BIOS ROM chip on the motherboard is probably faulty. It could also be another component on the motherboard.

You should make sure that all of the BIOS settings in the system are correct, by rebooting the system, going into BIOS setup and double-checking all the values (hopefully against a recent


If you have reset the CMOS memory you need to go into the BIOS setup screen and reconfigure the BIOS. To do that you need to press a key while the computer is booting. Usually F2 but can be other keys. It should tell you on the bottom of the first screen which key to press to enter BIOS setup.
If you don't know the settings the should be one for optimal defaults - use that one. You will also need to reset the time and date.
Save, Exit and re-boot and everything should then work.
During the boot process you will see on the screen to press delete to enter setup
Press and hold delete 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

hope this helps
don't forget to vote

Feb 11, 2011 | Computers & Internet

6 Answers

CMOS Error


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

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5 Answers

Bad BIOS checksum.... CMOS bad checksum errors


BOOT BLOCK COMPATIBLE VERSION VER .005
BAD BIOS CHECKSUM

CHECKING FOR CD ROM
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
NO CD-ROM FOUND
CHECKING FOR FLOPPY DISK
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
NO FLOPPY DISK FOUND

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

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