CMOS checksum error motherboard issue... Solved

Question

Hello,

I have a startup problem with my PC; I am getting the following error message:

CMOS checksum error - defaults loaded

then F1 to continue or del to enter the BIOS

but the PC freezes and does not respond.
I should point out that it is an MSI K7N2 Delta2 motherboard
I have tried with another battery, but the problem persists.

Thank you for your guidance.

A+

Configuration:  MSI K7N2 Delta2 motherboard

FireWille · Accepted Answer

Hello.
I had the same problem this afternoon and after analyzing the issue, here’s how I solved it.
1) Make sure your keyboard is properly connected to the PS/2 port and not to a USB port. There are small adapters available.
2) Disconnect all your hard drives except for the system drive.
3) Start your PC and enter your motherboard's BIOS.
4) Check your BIOS settings and exit while saving the changes.
5) Reboot your PC and then completely power it off.
6) Reconnect the hard drives.

Everything should work normally.

For those interested in the why and how, here’s my interpretation of the problem.

First, what does "CMOS checksum error" mean?

CMOS: it’s a small chip that keeps the configuration of your BIOS in memory. It is a volatile memory powered by a small battery on your motherboard.
Checksum: it’s a logical operation that verifies a data packet. Basically, you add the bits at the beginning and the end and compare the result.
Error: I hope you can guess what that means.
So a "CMOS checksum error" indicates a problem between the BIOS information and your PC's configuration. This can be due to a failure of the CMOS battery, a change in it, or in my case, a motherboard flash. In these three scenarios, the BIOS settings have been erased from the CMOS and your PC gets confused. That’s why it’s useful to disconnect anything non-essential to avoid conflicts and connect your keyboard to the PS/2 port to ensure it is recognized properly.

There you go. I hope I was clear and not too boring.
Hoping I could shed some light on your lantern.
Best regards and good luck.

lavaldinio · Answer

same problem as you if you find something I'm interested thank you better to have 1 who knows than 2 who are looking

greg · Answer

I have an MSI 850Pro5 motherboard, I also changed the battery but it’s still the same, the screen is frozen and I can’t access the BIOS.  Have you found a solution?   Thanks in advance.

e_clair · Answer

same for me
I changed the battery
and at the first startup, I also got a CMOS checksum error
however, I was able to launch Windows XP by pressing F1

I have a GA 8IDX motherboard

but I would also like to understand why just changing the battery causes this type of message.

See you soon

damsouche · Answer

Hello, we had the same issue as you... cmos error + frozen screen, unable to click on F1 or Dell.
WARNING TO AMATEURS: We solved the problem. The keyboard was plugged into the mouse port!! lol!!! So maybe check your connections.

Claude Lachance · Answer

I advise you to consult the following page: bios cmos checksum error defaults loaded  -- Better to die than to be defiled

natuli · Answer

Indeed, keyboard connection issue, check the quality of the keyboard plug.

laurent86 · Answer

Hello,
For Claude Lachance, in the thread you are referring to, there is mention of a problem with the time, but in my case, the time is intact and just pressing F1 makes it go away as if nothing happened.

lunique · Answer

I deeply thank you because my status is resolved. Thank you all.

moradb · Answer

Hello everyone,
nothing to do, I've tried all the methods but my keyboard doesn't want to cooperate.

So I can't press F1 or F10

In my case, the problem started when I wanted to add
RAM, it detected the change and asked me to press F1 to validate
and save the hardware it had detected, but the keyboard wouldn't work.

Next to my battery, there is a button; I pressed it for 5 seconds and turned the power back on, still the same.

I removed the battery and now there is error 162, in addition to the rest, and the keyboard is still unresponsive (PS/2 or USB).

I have a floppy disk drive; maybe I could flash it, but how?

My computer is an HP D530, the motherboard is also HP, but I can't find a reference.

Thank you

trompettator · Answer

Sorry, but it's "une pile" and not "un pile"...  That's all :)

Iomega · Answer

Hello everyone, I have the same problem as most of you, but on top of that, my hard drive isn't even recognized even though it's new. Thank you for helping me if you have an answer.

lorenzoDinome · Answer

Hello, I have another problem that's pretty similar: So I turn on my PC, and up to that point, it works, then it shows me a CMOS CHECKSUM ERROR... the keyboard works too, so I can press F1 and continue, everything works until my screen goes completely black and I can only see my mouse! If anyone has any information on this, thank you!

gege · Answer

I have this problem too because the BIOS chip socket on my motherboard is broken (due to a bad screwdriver hit) which causes me to have this issue at every startup.

Personally, I press F1, then Escape, then Enter, and then Windows starts normally.

lorenzoDinome · Answer

Yes, but where is the BIOS battery slave located? If you could send me a photo to better explain this! Thank you, I should mention that I changed the BIOS jumper position to reset it but it didn't work! No matter how many tips you give me, it doesn't work! I'm eagerly waiting for you to send me a photo of what a BIOS battery slave looks like.

kawah2 · Answer

well, I have the same problem too.

kawah2 · Answer

I opened the PC and noticed that the BIOS fan is not spinning. A word to the wise: if your BIOS fan isn't spinning, in my opinion, the BIOS is dead and I think the motherboard is too.

r-one2x2 · Answer

but if ... next to the thermal hydraulic pump of the connecting rod of the proco -- it's just my humble opinion, I accept that it can be challenged!

jmp59 · Answer

It's a riddle. Everyone to your crystal balls!  I bet on the CPU fan.  --  To err is human, to persist is diabolical.

r-one2x2 · Answer

raaah, you chose the most likely option!!! I would say... well nothing actually -- it's just my humble opinion, I accept that it can be questioned!

Claude Lachance · Answer

It might just be the fan in the "woods" he's talking about. It's sure that when the wind turbine has hiccups... 8-)   -- Bring us Bobo and hang the ergonomists!!­!  Down with the vile and bloody red hook!!!

kawah2 · Answer

Here, if you don't want to open your PC, click on this and take a close-up, you'll see the wind turbine's power cables haha before saying anything silly, do your research http://www.ldlc.com/fiche/PB00017946.html

kawah2 · Answer

Anyway, the fan isn't working.

chevalier_yah00 · Answer

I have the same problem. I've checked everything. I fixed one of my issues: the black screen due to a loose CPU fan. I changed my fan, and now I have the CMOS checksum error... So I'm leaning towards either the video card or the CPU being incompatible with the motherboard. I will check these two possible causes and let you know about that. Additionally, a virus or spyware could also be the source of this issue, so remember to check your hard drive. The best solution is to format everything and reinstall. That's what I'm going to do to remove all the old configurations that could be causing several problems, as we've been told.

--
For further information, write to me and I will respond as soon as possible.
Chevalier_yah00@+++

meurone · Answer

I encountered the same CMOS problem; I replaced the battery  but at first, the issue seemed to persist. A few days later, everything fell into place (almost 17 days). Now I have no problem, but I believe I understand (correct me if I'm wrong) the issue.  With a nearly empty battery, the CMOS memory loses the info on the installed peripherals and subsequently can't identify them anymore, which causes a problem. When it no longer identifies a RAM, for example, it considers that it's not installed, and thus a PC cannot boot without RAM.   BEST REGARDS

kawah2 · Answer

ok but it only works for you because I tested my battery and it gives 3 volts, that said I still replaced it and the problem persists

ludox · Answer

Hello,  It's not the BIOS fan, it's probably the chipset fan. The BIOS is a tiny ridiculous program that sits on a chip that doesn't need cooling. And if it's not spinning, it's probably clogged.

ludox · Answer

Your battery is dead or your motherboard is dead. If replacing your battery doesn’t change anything, get used to it or replace the motherboard.  Ludo, the tech from Lens

CMOS checksum error motherboard issue...

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