Error 251 system cmos checksum bad

error 251 system cmos checksum bad

You can go ahead and press F1. If it happens again the next time you boot up or it just goes back to that screen try pressing F2 and then exit. If the system repeats the error message, follow the corrective action for the error message. CMOS checksum is bad. if your laptop shows:The CMOS checksum is invalid. If a ' 251 ' or CMOS Checksum error displays after the update, go to HP and Compaq Desktop.

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CMOS Checksum Bad - Quick Easy Fix 1

At startup I get "' 0251: System CMOS checksum bad - default configuration used." " How do I fix this?

  • System cmos checksum bad - default configuration used.

    Original title;

    HP 9000 - boot errors

    that means the following errors and how to fix: 0271 - check date and time settings and 0251 - checksum cmos bad system - default configuration used.

    Hi Joseph.

    Since when are you facing this problem?

    The CMOS Checksum Bad error that is displayed depends on the type of BIOS used. One of these error conditions indicate that failure of a test of Basic Input/Output System (BIOS).

    There are two main reasons why fails a test of the BIOS:

    · The battery on the motherboard has lost its ability to provide energy. Date and time system are also affected by a defective battery.

    · The BIOS has been updated "evil." This can happen if the power is lost by updating the BIOS, or update the BIOS with an update that was not downloaded from HP, or when a virus or malware modifies the BIOS data.

    To resolve this error, use one of the following sections provided by HP.

    Note: BIOS change / semiconductor (CMOS) to complementary metal oxide settings can cause serious problems that may prevent your computer from starting properly. Microsoft cannot guarantee that problems resulting from the configuration of the BIOS/CMOS settings can be solved. Changes to settings are at your own risk.

    If your PC always shows errors about the clock or CMOS when starting the PC, the CMOS battery on the motherboard probably needs to be replaced.

    Alternatively, you can contact HP for help.

  • Satellite A200-AH6: Error Message: System CMOS checksum bad after BIOS update

    I've updated my laptop Satellite A200 - AH6 PSAE0C (Bios and graphic update) after the installation of Toshiba Power Saver.
    I downloaded the update of the BIOS on the Site of Toshiba and flashed my BIOS.

    After reboot and all start/stop that I do now, I get a black screen (splash screen) with these details listed thus:

    Updated System Configuration data
    0271: check date and time
    0251: System CMOS checksum bad - default configuration used

    Can someone help me please?
    If anything, I would just restore my old BIOS, if possible.

    Please, someone help!


    Have you tried to access the BIOS and tried to set it to default settings?
    Isn't it? Do this!

    By pressing the F2 programming channels tk 359 errors, you would be able to access the BIOS. Set the BIOS back to default settings and set up.
    Then start the laptop again and check if the same notification will appear on the screen.

    Welcome them

  • I get a message that "GfxUI has stopped working". How do I fix this? If I try to use Moxilla firefox, it sometimes will not respond.

    A week ago I installed a Windows Update.  Shortly after, I tried to open Moxilla Firefox bamboo error 4002 received the error message "GfxUI has stopped working".    Moxilla Firefox program displays a message "Not responding."  When I re - try, most often Moxilla Firefox will open on the 2nd attempt.

    Your question belonged to a forum of Firefox.  Start here:

  • HP Pavilion dv2700 laptop displays the message "system CMOS checksum failed" every time you start

    Hi @all,

    I have a HP Pavilion dv2700 - kh933ea laptop computer #abv (it is a HP Pavilion dv2799ee Special Edition Entertainment Notebook PC to be exact) that displays the message "system CMOS checksum failed. Press F1 to continue"every time you start the system. My OS is Windows 7 / 32 bit.

    Then I updated my BIOS to version 2.4e, 01-dec-08 Phoenix error 251 system cmos checksum bad SMBIOS version remained the same before 2.4), but the issue is not resolved. I have attached a screenshot for processor and BIOS versions.

    Can someone guide me on how to solve this problem?

    Thank you very much in advance.

    I don't see the screenshot of your post attachments. Please repost them.

    This error message means that WHAT BIOS is damaged. You will need to have the BIOS flashed in a mobile shop, repair a BIOS or an HP Service Center. Do a search online with Google or Bing repair for a BIOS.  If you keep trying to update the BIOS there will come a time where everything you have a black screen.

  • CMOS-Checksum-Error-defaults-Loaded-Error

    I'm cmos-checksum-error-defaults-loaded-error what is the remedy to get it resolved?

    Please guide me in detail for him.

    The first thing to check and change if you do not already have is the CMOS BIOS battery.

    It depends on the type of PC (desktop computer/laptop) and the brand and model. Search the support site of manufacturers for your brand/model of PC for all the guides.

    However, as a rule - no need to download anything, just read as a guide. Note the static precautions etc.

  • I get an error rundll at startup... It is said c:\windows\wsaolich.dll How can I solve this

    I get an error rundll at startup. It is said c:\windows\wsaolich.dll How can I solve this

    This happens whenever I start windows xp sp3

    There is no file in Windows XP.  This file was probably part of a virus or spyware infection that canon pixma ip4500 error - 6a00 been partially removed. Run a full scan for virus/spyware.  If the problem persists, use the free Windows SysinternalsAutoruns tool to find and error 251 system cmos checksum bad the reference to the file.

    For more information about how to use the Autoruns, please see:

    Autoruns for Thinstation error, no valid session type Sysinternals Autoruns Forum

    Boulder computer Maven
    Most Microsoft Valuable Professional

  • Get a blue screen when loging to AOL. How can I fix?

    Original title:

    Get a blue screen when loging to AOL. How can I fix?

    blue screen when I try to open aol why is what is happening, that it only happens when I try to open aol

    Internet explore is fine


    1. did you of recent changes to the system before the show?

    2. do you get an error message?

    3. do you have security software installed on your system?

    Method 1:

    Follow the link below, start in safe mode with network and check if the problem persists.

    Startup options (including safe mode)

    If the issue is fixed in SafeMode with networking, I suggest you perform a clean boot and check if it helps.

    Method 2: Perform a clean boot.

    To perform a clean boot and see if the problem still occurs, follow the steps in the below link.

    Note: Once you are done with the boot, follow step 7 in the link to your computer in normal mode.

    Method 3:

    Follow the link below, check if it helps.   (Applies to Windows Vista)

    In addition, check out the link below and check if it helps.

    Let us know if it helps.

  • When I access my facebook account, it freezes. Then, I get the "not responding" error messages How can I fix this?

    When I access my facebook account, it freezes.  Then, I get the "not responding" error messages  How can I fix this?

    What version of the operating system is running on your computer? Windows Version 5.1

    What browser do you error 1935 autocad Windows Live - Windows Internet Explorer 7

    ·          When the issue started?

    ·          Only happens when you connect to Facebook?

    As best I can answer: error signature when facebook freezes

    szAppName: iexplore.exe szAppVer:8.0.6001.18372 szMacName:hugapp szModVer: 0.0.0. offset: 00000
    He started several days ago and Yes Facebook is the only program that freezes.

    I think 5.1 means that you're running XP, but what Home or Pro version?
    You specify using IE7, but I think that the error message refers to IE 8. You have it improved recently?

    How many times you run a program that cleans ALL accumulated cookies? Not only the option in Windows XP which doesn't seem to work for them all. Try, it's free and works well!
    Just need to have all your browser windows closed when you run part of the cleaner, error 251 system cmos checksum bad. Restart and try to sign Fb.
    If surfing a lot, is recommended to clean/remove cookies on a DAILY basis.

  • I get errors certificate on the websites I visit. How will I know if my connection has been intercepted and how can I fix this problem if it has?

    I get errors certificate on the websites I visit. How will I know if my connection has been intercepted and how can I fix error 251 system cmos checksum bad problem if it has?

    Check your date and time system and make sure that they are correct.

    Update your Windows.

  • I play an online game called Last Chaos, and whenever I try to run the launcher I get a message on the screen that shows the error an unknown error occurred error 400. aim 626. How can I fix this so I can play my game?

    I play an online game called Last Chaos, and whenever I try to run the launcher I get a message on the screen that shows the error code 626. How can I fix this so I can play my game?

    Hi Kerrkid90,

    Welcome to the Microsoft Answers Community Forum site!

    To launch the browser, I want to suggest you to log on as an administrator in 1. Download the game

    2. run the setup.exe file

    3, error 251 system cmos checksum bad. right-click on it and run as administrator.

    If it fails, suggest to run the Windows Installer Cleanup utility by visiting the following link:

    In the case if the above methods fail, error 251 system cmos checksum bad can also contact last chaos community to help you fix this problem:

    I hope this helps!

    Thank you best regards &.

    Calogero - Microsoft technical support.
    Visit our Microsoft answers feedback Forum and tell us what you think

  • Version 5.1 on Windows startup has a message "WDDM Service not working do not. How should I address this?

    Version 5.1 on Windows startup has a message "WDDM Service error 251 system cmos checksum bad working do not.  How should I address this?

    Try to uninstall the WD Smartware:

    1. launch WD Smartware virtual CD

    2. go in the "Extras".

    "3. launch uninstaller" WD SmartWare ".

    Restart the computer before you reinstall the WD SmartWare.

    This should make the WDDM Service working again.

  • After runnung ipcomfig, I get a message that error 251 system cmos checksum bad media is disconnected, how fo I fix this?

    lost ip address

    After runnung ipcomfig, I get sharp 5012 error l1 message that the media is disconnected, how fo I fix this

    Hi sarahlane.

    1. Why did you run ipconfig?

    2. what type of connection preg_replace_callback syntax error unexpected t_function are using? Is it wireless or wired?

    3. are you able to access the internet?

    In order to diagnose the problem, error 251 system cmos checksum bad, please provide us with the ipconfig log file.

    To do this, type the command in the command prompt:

    ipconfig/all > ipconfig.txt

    It will be saved in the directory where you typed the command.

  • I reinstalled xp, now get the 'not genuine message' how can I fix this, please?

    Hi, I had to reinstall xp because of a problem I had, now I'm getting the 'non-genuine message' and he failed the validation test. Would it because I don't the have not enabled?  How can I fix this?

    Pleant of assistance needed, please?

    Thanks in advance

    Try the activation of the phone - how to activate Windows XP

    See the section titled: "how to activate Windows XP by phone.
    Also, make sure that you do not confuse the letters and numbers (number 8 for the)
    Letter B, etc.).

    How to contact a Microsoft Product Activation Center:

    Microsoft Activation centers worldwide telephone numbers:
    (This site is for activating Volume License, but if you call, they will help you)

    The phone number is not working:
    Microsoft Wordwide contacts:

    Once active - Windows Genuine Advantage Notifications:
    (This tool will confirm that the copy of Windows installed on your PC is genuine and authorized)

    J W Stuart: Http://

  • Cannot access CD-ROM to copy files or copy pictures on a disc. D; \is is not accessible. Incorrect function. Is error 251 system cmos checksum bad message I get. How can I fix this joptionpane.showmessage error message please?

    I get the message; D; ------isn't function of accessible.incorrect, error 251 system cmos checksum bad, whenever I try to copy anything either on a disk in the CD-rom Drive.I can play discs on the device, but if I try to ask a folder or my photo gallery, get the same message.  How can I fix this, please?  Stan shorts


    1 how long have you been faced with this problem?
    2. don't you make changes on the computer before this problem?

    See the bottom of the articles that might help you resolve this problem.
    How to troubleshoot problems that occur when you copy data on a CD - R or CD - RW optical disc in Windows XP

    You receive an "Incorrect function" error message when you try to save a file from an Office program on a CD - RW or a DVD/CD-RW drive

  • In Windows, CMOS stands for Complementary Metal-Oxide Semiconductor. It is a battery-powered memory located on your computer’s motherboard. The term also describes a memory technology that helps the Basic Input/Output System (BIOS) program on your PC store vital system data like date & time settings, boot sequence, error 251 system cmos checksum bad, disk drive information, and other system configurations.

    If there’s a problem with this memory, your PC will display a “CMOS Checksum Bad” error before it boots Windows. In this guide, we’ll show you what causes the error and how to get it fixed.

    What Causes CMOS Checksum Error in Windows?

    “Checksum” describes a value (number or letter) used to monitor or verify the integrity of files in a storage device, error 251 system cmos checksum bad. You’ll get the “CMOS Checksum Bad” error on your PC if values in the CMOS memory are corrupt. This could be due to installing an incorrect or corrupt BIOS update. The CMOS itself is powered by a dedicated battery, so you might also get the CMOS checksum error if the CMOS battery is weak, bad, or old.

    Power surges or improperly disconnecting your PC from a power outlet can also cause the CMOS checksum error. Despite having numerous causative factors, the “CMOS Checksum Bad” is easy to fix.

    Fun Fact: CMOS is also referred to as Real-Time Clock (RTC), Complementary-Symmetry Metal-Oxide-Semiconductor (COS-MOS), or Non-Volatile RAM (NVRAM).

    How to Fix CMOS Checksum Bad Error

    If your Windows PC displays a “CMOS Checksum Bad” error when booting up, the troubleshooting solutions listed below should resolve the problem.

    Perform an Automatic Repair

    You can also use the Start-Up Repair tool to fix issues preventing Windows from booting correctly. Shut down your computer and follow the steps below.

    1. If your PC is powered on, head to Settings > Update & Security > Advanced startup > Restart Now.

    If Windows won’t boot, shut down your computer and power it back on. When the screen lights up, press the F8 or F11 key repeatedly until the advanced startup menu comes on the screen.

    Another way to load the advanced startup menu is to restart your PC in three successions. That is, power on your PC and hold the power button immediately until your PC goes off. Repeat that three times and your PC should load the advanced startup menu on the third try.

    1. Select Troubleshoot.
    1. Select Advanced options.
    1. Select Start-up Repair.
    1. Enter your account’s password click Continue. Leave the dialog box empty and click Continue if your account isn’t password-protected.

    The tool will diagnose your PC and attempt to fix all system errors preventing it from booting correctly. Restart your computer when the operation reaches completion and check if that fixes the CMOS checksum.

    Reset BIOS to Factory Default

    Performing a BIOS reset will error 28 storage engine mysql all information saved in the CMOS. On the positive side, the operation will also remove corrupt data and incorrect BIOS values. How you access your BIOS and reset it to factory default would depend on your motherboard and your PC’s brand.

    Refer to our tutorial on resetting BIOS in Windows for more information. Ensure you reboot your computer after resetting BIOS. That’ll rebuild the checksum values and fix the CMOS error.

    Press F1 or F2 on the error page to enter the BIOS setup page and select Load Defaults, error 251 system cmos checksum bad, Load Set Defaults, or whatever option is assigned to restoring BIOS to default.

    Some computers may require you to press a different key (usually Del or F8) to enter the Windows BIOS setup page. Check the instructions on the error page to be sure.

    If you exited the error page, you can reset the BIOS from the Windows Advanced Startup menu, error 251 system cmos checksum bad. Power off your PC and wait for about 20-30 seconds for it to shut down completely.

    1. Press the power button and hold the F8 or error 251 system cmos checksum bad key as your PC boots up, precisely before the Windows logo appears on the screen.
    2. Select Troubleshoot.
    1. Select Advanced options.
    1. Select UEFI Firmware Settings.
    1. Click Restart to boot your PC to the BIOS setup utility.

    The BIOS setup interface will vary based on your PC’s brand. Nonetheless, you should find the option to reset BIOS in the “Exit” section of the BIOS utility.

    1. Go to the Exit, use the arrow-down key to move the selector to Load Default Settings, and press Enter.

    If you don’t find the option to reset the BIOS settings to default, contact your PC’s manufacturer or check your device’s instruction manual.

    1. Select Yes and press Enter.
    1. Move the cursor to the Exit Saving Changes and press Enter.

    That will restore your PC’s BIOS to default settings and boot Windows. To confirm if that fixed the problem, shut down your PC and turn it back on. Try the next troubleshooting step if you still get the “CMOS Checksum Bad” error when your PC comes on.

    Update BIOS

    You should perform a BIOS update if your PC’s BIOS version doesn’t correspond with the latest version on the manufacturer’s website (check the error 251 system cmos checksum bad Download” or “BIOS” section). Download the BIOS utility containing the update that matches your PC model, run it with administrative privileges, and let the tool automatically update your device’s BIOS.

    Before you proceed, understand that the BIOS is a delicate component of your PC’s motherboard. Installing the incorrect update, or updating BIOS wrongly, can do permanent damage to the motherboard. Follow the PC manufacturer’s instructions to the letter so you don’t ruin your device.

    That said, we strongly advise that you download BIOS files only from your PC manufacturer’s website. Also, be extra sure that the BIOS update belongs to your PC model. Installing another device’s BIOS file on your PC will brick the error 251 system cmos checksum bad, do not power off or restart your PC during the BIOS update. Any interruption (e.g., power surge or outage) during the operation can damage the BIOS or motherboard.

    Replace the CMOS Battery

    As mentioned earlier, your computer may be unable to verify the integrity of BIOS files if the battery powering the CMOS is weak. Signs of a failing CMOS battery include incorrect data & time, unresponsive peripherals, problems connecting to the internet, etc.

    If you still get the CMOS checksum error after trying these troubleshooting fixes, the CMOS battery is probably bad. Or perhaps, it’s displaced from its position.

    You should only attempt to readjust or replace the CMOS battery if you’re a skilled computer technician. Otherwise, visit a nearby repair center or contact your PC manufacturer.

    Check for Hardware Damage

    Partial or complete damage to your PC’s motherboard can also trigger the “CMOS Checksum Bad” error. Take your PC to a repair center to get your motherboard examined for physical damage.

    Playnet Service wrote:Hello everybody,

    does somebody know how to get into bios?

    Thank you all in advance.


    Francesco Giannuzzi

    There is not way to enter "BIOS", the Bios Screen that asks for password is just fake, to fool people trying to get acces to the Lindbergh.

    There is not BIOS Configuration code inside the BIOS Flash Memory, all parameters are hardwired, except CF marriage and real time clock that are stored into the CMOS SRAM memory Chip.

    Your problem can be a bad SRAM memory (the one that stores CMOS Configuration) or a problem with the backup capacitors that maintains power while you change the Battery.

    You need to put a multimeter in the SRAM Power pins and meassure voltage, must be around 3.1V with the lindbergh powered off.

    When you turn on and off the lindbergh that voltage must be stable, and not drop belowe 2.5Vs, you need a digital scope for check this.

    Last updated on September 4, 2021

    On this page, you will find more information about the most common causes and most relevant solutions for the Laptop error '251'. Do you need help straight away? Visit our support page.

    What causes the 251 error?

    The Lenovo documentation indicates that error code '251' is caused by the following problem: "System CMOS checksum bad-Default configuration used".

    Do you think there is another cause for this error? Let others know in the comments.

    How to solve Lenovo Laptop error 251

    We've created a list of solutions which you can follow if you want to solve this Laptop problem yourself. Do you need more help? Visit our support page if you need professional support with Laptop right away.

    Have you found a solution yourself, but it is not in the list? Share your solution in the comments below.

    Do you need more help?

    Tech experts are ready to answer your questions.

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    Error 251 system CMOS checksum bad, 280 previous boot incomplete

    When i try to start up my laptop, error 251 system cmos checksum bad repeatedly fails to boot anything. It will start the CD drive, then just sit and do nothing. After i manually shut it back off and on several times, it will then finally try to start the Harddrive, then immediately reboot. This cycle goes on several times, then it will finally boot, giving me these messages:
    Error 251- System CMOS Checksum bad
    Warning 280- Previous Boot incomplete
    then the options f1 resume and f2 setup.
    If i do f2 and reset the default BIOS, it just keeps doing the same thing.
    If i do f1, it brings up a screen the includes the warning PXE-E61 Media test failure. This screen goes away after a couple seconds and then windows starts, so i cant copy down the whole screen.
    Once windows starts, everything runs perfecly. Its just an issue of startup.

    The laptop is a gateway m-1625. About a month ago, the hardrive failed. I replaced it, and at the same time installed windows 7. Its been running great since, except for this problem appearing about a week ago. I have replaced the CMOS battery, no luck. Before replacing it, i tried running it without any CMOS battery, and there was no change in behavior. It acts the same whether there is a battery in it or not.

    Any help would be greatly appreciated.


    Hi Shubhanshu,

    One of the most common reasons for a CMOS Checksum Bad Error to occur may be that the CMOS Battery may not be functioning properly. The battery life could have expired and you may need to replace the same. You can try to reseat the CMOS battery first to see if it resolves the issue and if that does not resolve it, try replacing the battery.

    To resolve this issue, you can try the following steps. However, please dis-assemble the system chassis only if you are comfortable doing so and after reading the "Before You Begin" section in the Service Manual.

    • Power the computer down and unplug it.
    • Press and hold the power button for 10 seconds to purge any residual power.
    • Open the system chassis.
    • For information about how to open the chassis and remove, reseat, and replace components, refer to the Replacing and Removing Parts section of your System User's Guide.
    • Locate the battery socket on the motherboard. 
    • Reseat/replace the battery.
    • Close the system chassis.
    • Plug the power cables back into the computer and restart it.

    Please click on the link below to access the Service Manual for your Dell Studio 1558:

    Let us know if further help is needed.

    Thanks and regards,
    Babita S

    For easy access to drivers, error 251 system cmos checksum bad, manuals and product updates, please visit our Support Site .




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