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Bios system clock stops wen turned off and on boot error 0251:system cmos checksum bad message comes up

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  • balarisi Feb 02, 2008

    thanks i'll give that a go...

  • balarisi Feb 02, 2008

    that seems to have solved the problem with clock thank you so much. but now i have another problem with booting. i can not boot from the power button so what i have to do is switch it off from the mains socket and switch it back on in order to boot without pressing power button. any ideas? will be much appriciated...

  • nader70 Nov 29, 2008

    my acer travelmate 250 won't start normaly untill i conect the power pack then it works without i press on power button and cmos error apear when i enter the bios and load the default values and save and exit my laptob work but when i shut it down it won't start never untill i remove the cmos battrey and remove the power pack and reconect it again then my laptob start working without i press on the power button etc.............

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Replace the CMOS battery that is busted. after replacing configure in bios setup and load bios setup default.

Posted on Feb 02, 2008

  • Emelio Navaja
    Emelio Navaja Feb 02, 2008

    my pleasure t help you.

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2 Answers

A 1xx POST error code indicates a problem with the ??


It indicates a problem with the system boards. For more info, start here.

Oct 30, 2012 | HP PC Desktops

Tip

BIOS error, System Failure, Boot failure? ? Lets FIX it.


I guess everyone working on a computer is familiar with the word BIOS and what exactly it is? Still let me tell that BIOS is intelligent software that enables the system to start. I need not to mention that system here refers to computer. Bios facilitate the booting of a system without human intervention. BIOS is a program that is installed in a hardware chip known as ROM chip.

This single word matters a lot to most of the users who face various problems when their system failed to start normally or make some unusual activities. Each time I visit any technical forum I see a lot many users posting their problem regarding BIOS. I researched on internet about BIOS errors and from my knowledge and experience I am posting this piece of help for those who find themselves helpless in getting a solution to BIOS problems.

Sometimes BIOS itself provide a troubleshooting to most of the problems. When you power ON your system it give beep sound. Checkout some beep codes
1 short Beep indicates System is OK (Acceptance Beep)
Continue long Beep tells RAM Problem
1Long 3 Short Beep confirms RAM Problem
2/3/4 short Beep --its time to Check the RAM & Video Card

By now most of you have found some clue about the problems you are facing. Now learn about POST faults
1) K/B Error/ NO Keyboard present
· Check the loose cable connector
· Cable may be bad (Keyboard)
· K/B itself may be bad
· Check the physical condition of K/B connector on M/B
· If all these are ok & problem is still processed
· Than replace the keyboard port

2) Floppy disk drive Fail
· loose data & power connector of FDD
· Data cable may be bad (FDD)
· Load the CMOS defaults
· Floppy disk drive itself may be bad

3) CMOS Checksum error
· CMOS battery has gone bad replace it. (Weak)
· Check the CMOS jumper it may set on clear
· If the entire ok than check the CMOS battery jack, it may be bad

4) Invalid System Disk, Insert System Disk & Press enter when ready/ NTLDR is Missing
· Check the root directory; it may be formatted or missing bootable files.
· Repair the Windows or Reinstall the operating system.

5) Disk Boot failure, Insert System Disk & Press enter when ready
· Hard Disk check in POST Detected or not
· If not Detected Check the power cable
· Check the Master/Slave jumper setting.
· Also check BIOS setting

6) Computer gives message: Your computer has a serious problem
Back up your data & replace your Hard Disk
This error message is displayed due to the SMART option. This scans the HDD for errors, if it detect the errors than it show the above message. Follow the error message & back up your data on to another drive.

I tried to explain most of the problems along with their solutions. There could be a lot more solutions for the problems. Make your own search and try to fix BIOS problems at your own home.
Forward this to all those who need help!!
SOVI



on Feb 09, 2011 | PC Desktops

1 Answer

Bad check sum cmos


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.

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.

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 a certain key to press to enter setup
Press and hold that key 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
You will also need to set 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.
hope this helps you

Nov 18, 2011 | Toshiba Equium 2000 (PV1065E0-011FR) PC...

1 Answer

Getting a CMOS checksum bad error when starting my Acer M5640 Desktop with Windows 7 Thanks Daniel


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!!

Jan 21, 2011 | PC Desktops

1 Answer

Will not boot up. Get Bios Rom Checksum error, Keyboard error or no keyboard present. Manually shut down and turned on literally 30 times this morning before it would boot up. Then after a couple of hours...


most times a checksum error refers to the cmos battery. you may want to replace the battery and see if that helps. However this can also be a symptom caused by a bad power supply or a faulty board. Make sure you check your motherboard's capacitors for swelling or leaking.

hope this helps.

Dec 10, 2009 | HP Pavilion m7480n (882780389410) PC...

1 Answer

Cmos checksum error 0251


just replace the "CR2032 battery" in the motherboard... the enter the BIOS, then "LOAD SETUP DEFUALT"

May 18, 2009 | E-Machines T2682 (000002965) PC Desktop

2 Answers

Continuous beeping sound


Do you get video? If so then it could be a stuck key on the keyboard.

Do you get no video? If so then reseat the RAM.

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5 Answers

Bios check sum error


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

Nov 28, 2008 | PC Desktops

2 Answers

Boot problem


thanks for your reply i have replaced the battery with a new one and the same problem still exists... why does it not boot from power button?

Feb 03, 2008 | E-Machines eMachines Desktop PC

1 Answer

CMOS BAD CHECKSUM


Reseat your ram modules and remove the 2nd hdd
try rebooting
If same thing , then reset the Bios to default ,save and exit
Try again..
If same thing ? assuming you have more then 1 stick of ram,, try booting with 1 stick removed . to eliminate ram modules being bad
then switch ram untill you have verified ram chips are or aren't bad
Hope this helps

Nov 13, 2007 | E-Machines eMachines Desktop PC

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