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Bios setting messed up !!

I have a very old computer which has problem in its BIOS settings ..In the beginning it shows bad checksum error- defaluts loaded ..and then it asked to press F1 to continue and got stuck at ''veriifying DMI pool data'' ....it was showing another error in the beginning which says latency time recommended to 3. But when i changed latency time i never saw this error again. I tried to check the motherboard name and model number but could not find it anywhere. Could anybody please tell me how can i check if my BIOS settings are okay.
I reserached on internet where i got that this error sometimes is becuase of old battery so i replaced my motheboard battery but still getting same error. i already tried to set in on fail-safe and default setting but no help either.
Please let me know what else i can do. please dont say to discard it, i am just curious to learn.
Thanks in advance

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Posted on Feb 10, 2009

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Dell Inspiron 530. At start up gives CMOS checksum error defaults loaded. Options press F1, F2 or F12 computer does not react. Has new CMOS battery. RAM OK. Did CMOS clear and password reset. What else can...


When a Power Supply is plugged into power, there is a constant 5 Volts present. The 5 Volt Standby Power.

You press the Power On button.
This in turn presses against the Power On switch, located inside it's plastic assembly.

The Power On switch is a Momentary Contact Switch.
Temporary closing it activates the Soft Power On circuit.
A 5 Volt circuit that utilizes the 5 Volt Standby Power.

The Soft Power On circuit 'excites' the Power Supply, and turns it on.
(Sounds like a seedy novel)

The first chipset (Integrated Circuit) to receive power is the BIOS chipset.
The Basic Input/Output System program is initialized.

BIOS looks to see what devices are connected, does a Ram Memory count, turns the Processor on, and hands the computer over to the Operating System.

A checksum is computed as an error-detecting code, to protect the BIOS settings stored in CMOS.
Each time the computer is turned on, this number is re-computed; and checked against stored values.

If they do not match an error message is generated, to tell you the CMOS memory contents may have been corrupted; and therefore some settings may be wrong.
Your BIOS assumed the settings were incorrect, and loaded BIOS default settings; stored in BIOS.

(Default = factory settings)

CMOS Checksum Error Defaults - Loaded

New battery? Nope didn't help.
Clear CMOS, and password reset? Nope didn't help.

Leaves Virus as the problem, or hardware component/s on motherboard; are bad.

My thoughts?
Bad motherboard.

("BAD motherboard. NO,...........you know you have been bad,....don't give me that look. You're a bad motherboard."

Lol!)

That's my diagnosis.


(Unless you put the CMOS battery in upside down.
+ goes UP)

Regards,
joecoolvette

Mar 17, 2013 | Dell Computers & Internet

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P4M900T-M2 Intel Pentium R dual CPU E2160 1.8 Ghz default BIOS Setting


The CMOS Checksum Bad Error during the pre-booting process only indicates that the CMOS battery is exhausted and it can not no longer save the current BIOS settings, Time settings and many more things.

The first and and the only way, according to me, to solve this problem is to replace the CMOS battery.

Please let us know, if this solution have helped you.

Hope this helps, Mrityunjay.

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Error BIOS ROM CHECKSUM - SYSTEM HALTED.
Cause Bad Hardware
Solution Unfortunately this indicates that your computer BIOS ROM chip or Motherboard is physically bad. It is recommended that you contact your computer manufacturer or take the computer into local service center for repair.
If you wish to repair this issue yourself the motherbard will need to be replaced.
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.
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Apr 14, 2012 | ASUS A8N-E Motherboard

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I have an intel g41 motherboard....every time i switchon d pc...it shows check cmos error and the time and date are set to defaluts


This error occurs when the BIOS battery is flat. Replace the BIOS battery, most motherboards use a lithium battery type CR2032, this is a coin size battery. Check the BIOS battery type used on your motherboard before you purchase the battery.
After replacing the battery go to the BIOS setting and set the Date & Time etc. and you will not have this CMOS error.

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I used jumper bios reset and now gettin bad checksum error. on the mother board writen that K8N rev 1.01 i downloaded k8n motherboard rom file and renamed as k8n.rom and copied to disket. its deleting and...


Hi.

The most probable reason you are getting the bad checksum error is you have to set the date and time because you have cleared the CMOS and reset the BIOS.
You should also get a message that says press F1 to load defaults or press a certain key to access setup. Access setup (BIOS) and set the date and time. That should take care of the bad checksum error.
Another good idea is make sure the motherboard battery is not dead either.



Regards.

Jun 17, 2011 | ASUS Computers & Internet

1 Answer

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A bad checksum can be caused by a flat or near flat BIOS battery. Replace the battery and set the date and time.
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If you are using an old computer, there’s a possibility that you already encountered this error message during bootup; “CMOS checksum error – Defaults loaded”. At this point, the PC will halt its operation and requires you to press F1 to continue or DEL to enter setup (mostly but also depends on motherboard) to proceed.

This is caused by incorrect or corrupted CMOS values. BIOS settings are stored in CMOS. Each time the system is booted this number is recomputed and checked against the stored value. If they do not match, the error message will be displayed.

For most cases, this is caused by the motherboard battery. Buy a new one to any electronic retailers in your area and replace it. Turn on your computer and press the stated key to enter the BIOS setup. It can be DEL for some or F2 but this depends on your computer. On the BIOS menu, try to change the DATE and TIME settings because their values are reset to different value. Most settings are set to default so leave it as it is. Save the settings and reboot your computer.

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Situation Remedies If you have encountered this error and would like to fix your computer, here are some remedies for each situation:
CMOS Battery Not Functioning Properly: If you suspect 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 settings are lost, you can usually get them from your computer manufacturer. Now locate the battery and remove it, you might need to consult your computers manual or tech support to remove your battery. Take down the CMOS batteries 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 remedied the problem.
Your BIOS has Been Updated (either by you or possibly a virus): If your BIOS has been updated recently, your CMOS settings may have become 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 updated your BIOS settings, run a virus scan and make sure that the BIOS settings are back to the default.
The Computer Was Shut Down Improperly: Sometimes when running MS Windows, if you shut down your laptop or desktop 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 before turning off the power. Usually this entails going into the Start Menu/ Turn Off Computer/ Shut Down. If you received the error, shut down the computer properly, if this is the cause of the error, the error message will not return.

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