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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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Are the CMOS batteries good?

Posted on Oct 15, 2008

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CHECKSUM CANNOT MOVE COMPUTER FROM A BLUE SCREEN


In order to understand what a checksum error is, it is important to first learn what a checksum is. A checksum is a redundancy check during a computer's start up process, which makes sure that the computer's data is intact and unhampered. The data is scanned and tested for accuracy, either based on how well it relates to data elsewhere or based on previous data that was stored on the same computer. Essentially, all of the bits of data in a particular document or file are added up and a number or hash is created. This number or hash can then be compared to the number or hash generated from the same file on another person's computer or at a previous time on the same computer.
When does a Checksum Error Occur?

Although a checksum error can occur at any time while a computer is comparing data, it is most commonly present during a computer's startup procedure. During a computer's start up processes, the BIOS settings, which are stored in a CMOS memory chip, are computed and then checked against the previous value. If the computed values do not match exactly, the computer warns the user with a checksum error message that the data may have been changed or corrupted between start up cycles. All BIOS programs present a different error and therefore will either continue with booting or refuse to boot until the problem is corrected.

cmos-error.jpg

Depending on the type and the severity of the error generated, there may be one of a variety of ways to rectify the issue. The most common cause of a checksum error during the startup process is a faulty battery that is not providing sufficient power to the motherboard when the computer is off. However, motherboard malfunctions and viruses can also contribute to checksum errors.
Other Types of Checksum Errors

Another type of checksum error may occur with any program at any time. It is usual for many programs to now provide checksum information when that program is downloaded. Using a checksum program or MD5 hash checker, a user can quickly compare the checksum of a downloaded program with the checksum that the software developer provides. This is a common way to make sure that users are downloading the proper program and that no data was corrupted during the download process. Checksum errors originating from download errors can easily be corrected by re-downloading the problematic program.

if you have a windows disk you might try doing a repair from disk

Apr 14, 2013 | Dell Inspiron Computers & Internet

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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

HP Compaq NC6000\r\nWhen I press the power button it seems to start but the only thing I see is numbers going by rapidly in the form of kbytes (524288 KB ok) then it reads 162-system Options not set. Then...


Hi promano67

When you "start" the computer, and the {"Screen"} displays a "Error Message."[CMOS] "error checksum!"

Settings: "Default" loaded.A "checksum error" shows that:

The ("Boot-up Settings "have been changed?"), ie. "Booting OS."

*Boot File 'missing'.

"This can 'occur' if the computer was "shut-down unexpectedly."

Force Shut-down : Power lost; due to 'low battery...'

A ("Power Surge") can cause this 'problem' also.

"What 'happens is that the [CMOS] settings are lost!".
"To fix the problem!"

Do the following:

  • "Restart / Boot the computer.

  • Next, verify if the 'error message' displays?

  • If you are still getting the message?

  • "You will have to "Remove the CMOS battery form the computer!"

  • Shut-down the computer.

  • "Unplug the computer from the {Wall Out-let}.

  • Remove the Lithium battery from the "Notebook."

  • There is a compartment (underneath) the "Notebook that 'store' the CMOS battery."

  • "You will need a {very small Phillips screwdriver}._953.jpg *Remove the CMOS battery for: [30 minutes].

  • !Important: If you have to do it again?

  • Remove the CMOS battery for a {'longer amount of time'}.

  • Replace the "CMOS battery."

  • Next, "Only plug the Power Adapter into the computer.

  • "Do not - replace the "Lithium battery!"

  • Once you have completed these 'task'.

  • "Restart the computer."

  • "Press the [F2] key, to 'enter' the CMOS / BIOS Setup!" _951.jpg

  • Next, 'reset' (all) "Values to the Default Settings."

  • "Press the [F10] key to 'Save' the changes!"

!Important: "Take a 'moment to rate the help', so I can get 'credit' for the work.

Thank you!" - paul7of9







Mar 13, 2011 | HP Compaq nc6000 Notebook

1 Answer

Cmos checksum error & keyboard not function


CMOS checksum errors
Explanation: A checksum is computed as an error-detecting code, to protect the BIOS settings stored in the CMOS memory. Each time the system is booted this number is recomputed and checked against the stored value. If they do not match, an error message is generated to tell you that the CMOS memory contents may have been corrupted and therefore some settings may be wrong. BIOSes react in different ways to encountering this sort of error. Some will warn the user and then continue on with whatever settings were in the CMOS. Others will assume that the settings that were in the CMOS were corrupted and will load default values stored in the BIOS chip "for safety reasons". The error message will indicate which your system is doing.
Diagnosis: The most common cause of checksum errors in CMOS is a battery that is losing power. Viruses can also affect CMOS settings, and motherboard problems can also affect the stored values.
Recommendation: Follow the instructions in this section to address the CMOS corruption. 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 BIOS settings backup).

Sep 24, 2010 | Computers & Internet

1 Answer

Booting problem


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

Mar 05, 2010 | Microsoft Windows XP Professional With...

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

CMOS Error


hi

2 things, first, you simply need to replace the cmos coin cell battery or worst case scenario, your processor may already be on its way to failing.

Oct 15, 2008 | Intel Pentium 4 505J Prescott 533MHz...

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

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