Main Bios Checksum Error!!!

try to find a copy of the bios from the manufacture's website, and put it on a usb stick, then start the computer with the usb stick plugged in. if that doesn't work, you may have to replace the bios chip with a properly programmed one. if you can replace it, then you would have to replace your motherboard (unless I missing something here on how to recover the bios)

here are some of the basic codes, depending on which BIOS you have...

Also you do not indicate which fan? I would guess you mean the main Power Supply (PS)? In which case it could just be you need to replace the PS.

Here is a link to some other codes as well...
http://www.computerhope.com/beep.htm

AMI BIOS ERROR BEEP CODES

• 1 Beep - Memory Refresh Failure (check memory)
• 2 Beeps - Memory Parity Error in first 64KB block (check memory)
• 3 Beeps - Memory Read/Write Error in first 64KB block (check memory)
• 4 Beeps - Motherboard timer not functioning (possible motherboard replacement)
• 5 Beeps - Processor Error (may need replacement Processor)
• 6 Beeps - Gate A20/keyboard controller failure (possible motherboard replacement)
• 7 Beeps - Processor Exception Interrupt Error (may need replacement Processor)
• 8 Beeps - Display Memory Read/Write Failure (reseat or replace video card)
• 9 Beeps - ROM checksum Error (replace BIOS chip or motherboard)
• 10 Beeps - CMOS shutdown Read/Write error (possible motherboard replacement)
• 11 Beeps - Bad Cache Memory - test failed (replace cache memory)

Phoenix BIOS ERROR BEEP CODES
Phoenix BIOS beep codes are a series of beeps separated by a pause, for example:
beep --- beep beep --- beep --- beep beep would be 1-2-1-2

• 1-1-4-1 - Cache Error (level 2)
• 1-2-2-3 - BIOS ROM Checksum
• 1-3-1-1 - DRAM Refresh Test
• 1-3-1-3 - Keyboard controller test
• 1-3-4-1 - RAM Failure on address line xxxx (check memory)
• 1-3-4-3 - RAM Failure on data bits xxxx of low byte of memory bus
• 1-4-1-1 - RAM Failure on data bits xxxx of high byte of memory bus
• 2-1-2-3 - ROM copyright notice
• 2-2-3-1 - Test for unexpected interrupts

I hope this helps.

Solutions to CMOS Checksum Bad Error

The CMOS Checksum Bad Error can be fixed easily by following the listed steps carefully.

CMOS Battery may not be functioning properly

If you suspect that your CMOS battery is not functioning properly, you can easily change it. Before changing your battery, reboot your computer to make sure that the error still exists. If it does, go into your CMOS and write down all of the settings. If all the settings are lost, you can usually retrieve them from your computer manufacturer. Now locate the battery and remove it, you might need to consult your computer's manual or technical support to remove your battery (the battery a flat, shiny silver colored and coin-shaped). Take down the CMOS battery's information such as volt, size, etc. Once you have your new battery, you can replace it and reenter your CMOS settings. If your battery was the cause of the CMOS Checksum Bad Error, you should have solved the problem.

Your BIOS may have been updated

If your BIOS have been updated recently, your CMOS settings may have reset. Make sure that the values entered in the BIOS are correct or simply reset them to the default settings. If you believe that a virus has updated your BIOS settings, run a virus scan and make sure that the BIOS settings are back to the default.

The Computer may not have been shut down properly

Sometimes when running MS Windows, if you shut down your computer without first properly shutting down your operating system, it will corrupt the CMOS settings causing the CMOS Checksum Bad Error. You can easily avoid this error by making sure that you completely shut down your computer properly before turning off the main power. Usually this entails going into the Start Menu, clicking on Turn Off Computer/ Shut Down. If improper shutdown was the cause of the error, you may have solved the issue.



akuma_ryu21 rate it pls!!

Sounds like you CMOS battery is FLAT, please locate and replace, it is a 3.6V flat "Cell" This may just sort you out. Checksum error is because, something is different from the stored checksum it has in memory.

There are usually three main reasons that a CMOS Checksum Bad Error has occurred. They include:

• CMOS Battery may not be functioning properly. The battery life may have expired.
• Your BIOS may have been updated (either by user or possibly a virus)
• The computer may not have been shut down properly e.g. shutting off the computer's main power without first shutting down the computer (MS Windows requires you to shut down your computer before shutting off the power).

Solutions to CMOS Checksum Bad Error The CMOS Checksum Bad Error can be fixed easily by following the listed steps carefully.
CMOS Battery may not be functioning properly
If you suspect that your CMOS battery is not functioning properly, you can easily change it. Before changing your battery, reboot your computer to make sure that the error still exists. If it does, go into your CMOS and write down all of the settings. If all the settings are lost, you can usually retrieve them from your computer manufacturer. Now locate the battery and remove it, you might need to consult your computer’s manual or technical support to remove your battery (the battery a flat, shiny silver colored and coin-shaped). Take down the CMOS battery’s information such as volt, size, etc. Once you have your new battery, you can replace it and reenter your CMOS settings. If your battery was the cause of the CMOS Checksum Bad Error, you should have solved the problem.

Your BIOS may have been updated
If your BIOS have been updated recently, your CMOS settings may have reset. Make sure that the values entered in the BIOS are correct or simply reset them to the default settings. If you believe that a virus has updated your BIOS settings, run a virus scan and make sure that the BIOS settings are back to the default.
The Computer may not have been shut down properly
Sometimes when running MS Windows, if you shut down your computer without first properly shutting down your operating system, it will corrupt the CMOS settings causing the CMOS Checksum Bad Error. You can easily avoid this error by making sure that you completely shut down your computer properly before turning off the main power. Usually this entails going into the Start Menu, clicking on Turn Off Computer/ Shut Down. If improper shutdown was the cause of the error, you may have solved the issue

A BIOS checksum error is usually related to a near flat BIOS battery.
Replace the BIOS battery then boot up the laptop and go into the BIOS configuration and set the Date and Time settings etc. and the checksum error will disappear.

Hi there.
Try clearing the cmos
<<<<< you will see in the picture a plastic jumper (in this case coloured green), move it to the other position and hit the on/off button, then put it back in its original position and power up the machine again. Hopefully the issue will have been sorted. If there is no jumper remove the battery for an hour and make sure the power cord is removed from the back before you clear the cmos

Good luck and thanks for using Fixya!!

You can try flashing/updating the BIOS if nothing works.

Hi Oliver, the most common error related to the message,
(Bios Rom Checksum Error). Someone has left a floppy disk in the floppy drive. Once the floppy disk has been removed press the reset button on the PC, your windows will start normally. Next place to look is in your bios.
Open your manual to page 27.
Enter your bios & go to the title Advanced BIOS Features. Check First, Second & Third boot devices they should be as follows. Floppy disk drive, CD-ROM drive & primary hard disk drive. If both of the above are ok than try clearing the cmos/bios by resetting the cmos jumper (JP1) location on page 5. Descriptions of page five on page 6. CMOS settings on page 9.
When your system restarts re-enter your cmos & reset up your bios settings. Lastly if none of the above has fixed the error message, than remove the cmos battery & check its voltage. It should maintain 3volts. If yours' is lower than 3volts replace the cmos battery. There is one other possible fix. It’s an option not given lightly. Flashing a cmos/bios is not recommended unless all other options have failed.
Bios link for the EliteGroup P4VMM2 V8.1
http://www.ecs.com.tw/ECSWebSite/Downloads/ProductsDetail_Download.aspx?detailid=436&DetailName=Bios&DetailDesc=P4VMM2%20%20(V8.1)&CategoryID=1&MenuID=82&LanID=0
Main web site;
http://www.ecs.com.tw/ECSWebSite/Products/ProductsDetail.aspx?CategoryID=1&DetailID=436&DetailName=Feature&MenuID=52&LanID=0

Good luck Oliver!
Mike

Bios password or windows password

if bios password

1. Turn off power
2. disconnect power cord
3. open case
4. remove button cell battery
5. press power on button to dissipate any voltage
6. put button cell back in
7. plug in cord
8. reboot
9. cmos checksum error, enter bios, set date,time,etc

If windows
password is unknown

1. press F8 on boot
2. select safe mode
3. log into Administrator account
4. no password
5. go to start, settings, control panel, users,
6. select your account, select change password.