Cmos checksum error

Getting cmos checksum error - defaults loaded press f1 to continue. Pc boots into windows and seems to work OK. Don't seem to be able to get rid of this message though at startuop. Any ideas, it's anew board, the bios hasn't been updated the bioard is untouched?
Thanks............ Please help!!

Done all you mentioned, did select load defaults, save and exit thinking that would stop the checksum message but still it's ther. I just noted that if I keep the PC plugged in to the mains however the meesage does NOT appear on reboot. However if I unplug and they plug back in to the mains and switch on the message returns, could that point to faulty Lithium battery?

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CMOS Checksum Error on MSI 785GM-E51

Hi, I have 2 years old MSI 785GM-E51. Approximately 2 - 3 months ago, my PC just go hang without any reasons, even the mouse / keyboard won't respond to anything.
After I reset, sometimes it's fine, but sometimes it's hang again, the interval is random. Sometimes it even hang when in the POST or when i enter BIOS setting.
After several restart, it's sometimes gives me CMOS Checksum Error, so I decided to reset the CMOS using jumper method. After that my PC just works normal.
Until a week ago, my pc start to hang randomly again, the symptom is similar but this time sometimes it's not hang, but the PC just restart immediately with black / white / blue random pattern
displayed momentarily on the screen. And it always display CMOS Checksum Error. I already tried reinstalling Windows, and updating BIOS via flash disk from Live Update 5, no use.
I already tried to plug out my VGA and using the onboard one, still crash / hang randomly. I also test Memtest overnight with passing 11 pass without error.
Is it my motherboard already dead? or it's my PSU? CPU?
Here is my complete specs:
AMD Phenom II X4 955BE
MSI 785GM-E51
DDR3 Dual Channel 4GB RAM (corsair, forgot the model)
Radeon 5770
WDC 1TB
WDC 1.5TB
Amacrox Free Style 650W
Thanks in advance.

Quote
Yesterday i desperate enough and change some BIOS settings, and
surprisingly, the CPU is much cooler!
Try entering bios, hitting f6 for optimized defaults then save and exit. See if problem persists.
Quote
As far as I remember, no, the crash / hang time i remembered is when POST / boot / startup / browsing / install app / playing games / copy file.
And one more thing, when it hangs, it really hangs, not just the windows, sometimes it even not respond to reset button, so i have to power it off. But sometimes it respond
to reset button, but with quite a long delay, it could half a minute i think.
Have you tried re-seating the cpu,memory and all of the power connectors etc?
What are the amp ratings on the 12v rail of the PSU? I found this on thier website but dont have time to dig furthur: Quote
4-Channel 12V Rails Design
Although the VGA you list only needs 24a on a 12v rail.
Quote
what's cpuid / ram timings / spd? where i can look at it?
http://www.cpuid.com/
When the program opens, take a screen shot of the tab that describe how your ram is running, It will show the current timings,speed, single or dual channel. Also take a ss of the spd tab, which will show the jdec standards that apply to that ram and the xmp profile. Then post the SS's to imageshack or the link and link them.

Cmos checksum bad when bios update

WHen i try to update the bios i always get "Cmos checksum bad" after the computer restarts. I have both tried to use the live update in windows mode, and tried to update directly in bios mode using usb-stick. I get "Cmos checksum bad".
I have also "MSIHQ USB Bootable Tool and BIOS Helper" but that dident work at all. the images dident work, not even the backup it made (piece of crap software).
What is the problem????

If the update was good you will get the 'CMOS checksum error'. You need to clear CMOS, remove PSU from AC power and then clear CMOS.
>> clear CMOS guide <<

P6N SLI PLATINUM CMOS BAD CHECKSUM ERROR TIME DATE

I have the same problem. It’s driving me crazy. Here is my specs:
MSI P6N SLI Platinum LGA 775
Intel Core 2 Duo E6420 2.13GHz 4M shared L2 Cache
Foxconn GeForce 7900GS 256MB 256-bit GDDR3 PCI Express x16
Western Digital Caviar SE16 WD7500AAKS 750GB 7200 RPM
Kingston KHX6400D2LLK2/2G 2GB kit PC2-6400 800MHZ
LG DVD GSA-H50N DVD-R 18X
Matsu"I'm a potty mouth"a Floppy drive
Windows XP 32-Bit
CoolerMaster RP-500-PCAR – 500W
+3.3V +5V +12V1 +12V2 -5V -12V +5VSB
20A 20A 16A 16A 0.8A 0.8A 2.0A
Sometimes the computer boots ok, and everything works great.
Sometimes it just doesn’t boot, it just gives a blank screen. So, I press reset and the post gives the CMOS CHECKSUM BAD. F1 to setup F2 to default.
If I go to the setup everything is just like I left, including the time. Even if I setup the bios with default configuration, the problem continues.
Here is a list of everything I have tried
1) Replaced the battery 2 times. I checked with a multimeter. It’s 3V allright
2) Disconnected everything leaving only 1GB memory and the graphics card
3) Updated the bios version several times, to make sure I did it ok. I cleared the CMOS after allright
4) I read every post in this forum about bios and P6N SLI Platinum
5) Already checked the D-BRACKET. It shows 4 green leds when the screen is blank
6) Already checked fans: CPU and graphics fans works ok
7) Already tested with memtest86+ V2.01
8) Already upped the northbridge to 1.325V, CPU 3 notches and the memory another 3 notches.
So anyone has any ideas, or I’ll just have to go to a computer store and swap the graphics or the PSU and try to see if the problem vanishes??? It’s gonna be tough… they don’t like to let you test the merchandise….
PS: Thanks for all the help so far that you have been giving to TheGimp, after all, we have the same problem…

I had the same problem after ~8months of trouble free service; it was intermittent too. sometimes it would boot fine, others times i'd get the error message. I removed the battery to test it. it was fine. i cleared the cmos with the button while the battery was removed. i noticed that the battery holder seems not to be anchored to the board at all. I haven't confirmed this but it looks like the protruding metal clip holds it all together. i had contacted MSI support about the problem earlier. they told me to clear the cmos. i asked about the battery holder not being secure on the board, and, as in the typical support response to an unusual question, they gave me some vague, undecipherable response. So, anyway when i put the battery back in, i felt the holder kind of click into place. I haven't had any problems since.

Real Time Clock Error - Check Date and Time settings, System CMOS Checksum bad

Hello everybody,
Can help anyone to resolve my problem.
I have an Thinkpad W520 (42823FG), BIOS 8BET60WW 1.4 When I disconect AC power and remove battery and connect again, I see this message on screen:
"Real Time Clock Error - Check Date and Time settings, System CMOS Checksum bad
Press Esc to continue or F1 to enter Setup"
Is this a system board problem or CMOS battery problem ?
Thank you

Hello and welcome,
It's probably (hopefully) just the CMOS battery. The easiest way to find out is to just replace that battery.
Page 85 of the Hardware Maintenance Manual:
Hardware Maintenance Manual
Here's an example of the battery. I'm not recommending (or not) this vendor:
http://www.ebay.com/itm/New-Lenovo-ThinkPad-W500-W510-W520-W530-W700-W701-W701ds-CMOS-RTC-Backup-BAT...
Z.
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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T410 - how to recharge backup battery after - ERROR 0251 System CMOS checksum bad

Hey people
I would like to know how to recharge the backup battery ( internal one, keeping clock and date etc. )
i got the
Error 0251 System CMOS checksum bad— Default configuration used.
message and after looking at the T400 manual they write what to do:
Charge the backup battery for more than 8 hours by connecting the ac adapter.
ok sounds good, but i cant figure out how to properly charge it,
do i need to put the normal battery pack out and then attach it to the AC adapter, or not?
Does the laptop need to be running or will it be charged also turned off?
i would really appreciate if u could help me out and tell me the proper way to recharge!!
thanks already,
cheers,
Andi

Hello and welcome,
I didn't know that the backup battery was rechargeable. I don't think it is. You might be better off to just replace it.
The Hardware Maintenance Manual page 80 shows how to access it. According to the System Service Parts T410, the FRU number is 02K7078. They should be easy to find and inexpensive.
Z.
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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0251 error system CMOS checksum bad

A couple days ago, I turned on my laptop (Satellite A105-S4201) and it send me to a black screen with some information and the warning: 0251 system CMOS checksum bad. It now sends me to this black screen with the warning every time I turn on the computer and every time it comes back from hibernate. I have tried leaving it on for 24 hours to charge the battery but this hasn't worked. I've also installed the BIOS 6.00 and I still get the same error.
When I go to setup, the time and date and everything is all correct; I've reset defaults and keep getting this message. It doesn't ask for a password, it just gives me the 0251 error.
I've had this computer for almost 4 years and have never had any problems before. I read somewhere that it could be a problem with the CMOS battery, but I also read that they usually last for about 10 years. If I do have to replace it, where could I go and how much would it cost?
Any ideas on how to fix this? Any help would be greatly appreciated.

Hi Dantheman,
Try to reseat the CMOS battery first, or better replace it with a new one. You need to go to Sony's Authorized Service Center or a local technician if you're not comfortable doing this.
Thanks,
Vincent
If my post answers your question, please mark it as "Accept as Solution"

MSI P35 Neo-F cmos checksum "bad"

Hi
I bought the board mentioned in the title, and after putting my E5200 into it I realized that the MB didn't support it using the bios version it had in it. So, I used the AMI bios recovery thingy (http://www.msicomputer.com/support/BIOS_AMI_Recovery.asp) using floppy and after that I was able to boot it up properly.
But after changing the bios settings a bit, I faced the exact same problem as the fellow here (https://forum-en.msi.com/index.php?;topic=125698.0). I understood that I'm forced to flash the bios again using the MSI Forum HQ USB Flashing Tool mentioned in that topic.
The problem here is that I can't use that flashing tool as I'm not able to get into Windows and use the tool. The tool won't work on my second comp as it doesn't have MSI MB in it.
So what do I do to flash the bios? Any help would be appreciated.

Quote
I understood that I'm forced to flash the bios again using the MSI Forum HQ USB Flashing Tool mentioned in that topic.
You have to reflash the BIOS the regular way (and you are not limited to the MSI Forum HQ USB Flashing Tool (it is only an option). The AMI BIOS Recovery Procedure is not a regular way to update your BIOS. That CMOS Checksum Message you get after start-up is a known side effect.
Quote
The problem here is that I can't use that flashing tool as I'm not able to get into Windows and use the tool. The tool won't work on my second comp as it doesn't have MSI MB in it.
Here you go:
1. Download the following tool. Then install it on your second system:
http://files.extremeoverclocking.com/file.php?f=197
2. Download the DOS-File.rar Archives that you find attached at the bottom of this post and unpack the files into a folder of your choice.
3. Start the HP USB Format Tool and select "Create DOS Startup Disk". Point the tool to the DOS-Files you just unpacked:
Your USB Flash Drive should now be bootable.
4. Download the latest BIOS Version for your board: http://download1.msi.com/files/downloads/bos_exe/7360v1A.zip ... and copy the following files to the root directory of your USB Flash Drive: Afud408.exe (Flasher) and A7360IMS.1A0 (BIOS-File).
5. Hook up the just prepared USB Flash Drive to your P35 Neo-F and force it to boot from it. Once you reach the DOS Command Prompt, type the following command to start the BIOS Flash:
Afud408 A7360IMS.1A0 /P /B /N /C
Once the procedure is over and you did not get any error messages, turn off your system, clear CMOS with main A/C power cable removed from PSU. After that, things should be back to normal if everything went fine.
Note: In order to force your P35 Neo-F to boot from the USB Flash Drive, disconnect all other drives so that the USB Flash Drive is the only bootable device connected to your system. When you get the CMOS Checksum Message after start-up, simply load defaults without entering BIOS Setup. The system should then move on to booting DOS from your Flash Drive.

MOVED: K7N2 - Bios Checksum Error - But wont load program to flash bios

This topic has been moved to AMD nVidia/AMD/SiS SocketA based board.
K7N2 = nVidia nforce2 chipset = AMD nvidia SocketA forum
https://forum-en.msi.com/index.php?topic=73760.0

I never cleared the cmos with the power on. Sorry i didnt make it clear, but yeah i always made sure the power was completely out. I left the battery out last night too, but still no change. All cables are on right, and I'll try taking out all the cdrom and cd when i get home. I cant get into Bios (pushing del key). all i get is two beeps and boot block telling me that there is a Bios Rom Checksum error (again, sorry i wasnt being very clear).
I think it might be pretty much stuffed. I'm tempted just to go to the store and buy another one as they aren't too expensive and probably not too much of a price difference from getting a new bios chip and having to wait for 2 weeks while it gets delivered. But then again maybe i should just be patient and save myself some money.
Hmm, could it be due to bad RAM? I'll try swapping it with my brother's and see what happens. It's kind of ridiculous that they give the same generic error message for a multitude of different problems, someone should fix that.

K7N2 - Bios Checksum Error - But wont load program to flash bios

Hi there, my computer restarted itself due a problem with windows (kernel dll or something arather), since then it wont boot at all, beeps twice and says Bios Checksum error.
Now i understand this means the Bios is corrupted and i need to re-flash it. I looked at instructions on how to do this and followed them to the button. However, it wouldnt load a boot disk at all so i reset the Cmos using the jumpers.
After reseting it would now read the disk (i can hear it make noises) but it would only get as far as starting to load the award flash program, i.e. it just says "Starting..." but then the disk will stop reading at it will just hang then doing nothing.
I've tried numerous disks and numerous bios version numbers (but obviously the right ones for my motherboard: K7N2 Delta series Ms-6570), and i've tried using different types of bootdisk all with the same result.
Is there anything else i can do? or is it pretty much screwed and i have to take it back to the shop i bought it from and request a new bios chip (technically its still under warranty, as its only 10 months old but would this be covered with the warranty?). I can foresee taking it back being a huge hassle so if there is anything i can do to avoid this, it would be greatly appreciated.

I never cleared the cmos with the power on. Sorry i didnt make it clear, but yeah i always made sure the power was completely out. I left the battery out last night too, but still no change. All cables are on right, and I'll try taking out all the cdrom and cd when i get home. I cant get into Bios (pushing del key). all i get is two beeps and boot block telling me that there is a Bios Rom Checksum error (again, sorry i wasnt being very clear).
I think it might be pretty much stuffed. I'm tempted just to go to the store and buy another one as they aren't too expensive and probably not too much of a price difference from getting a new bios chip and having to wait for 2 weeks while it gets delivered. But then again maybe i should just be patient and save myself some money.
Hmm, could it be due to bad RAM? I'll try swapping it with my brother's and see what happens. It's kind of ridiculous that they give the same generic error message for a multitude of different problems, someone should fix that.

'7-error BIOS checksum error while installing HP update

I received an update from HP tonight 'HP Consumer Desktop PC BIOS Update' everything went well until the install start when I received the followinf mewssage '7-error: BIOS checksum error' and everything stoped -- what is the problem and how do I correct it so I can successfully install this update?

They are all part of the Checksum Error problem. You may also be interested in this:
https://www.youtube.com/watch?v=Pdp_L5IxaNI
All computers whether laptop or desktop have a CMOS batterie.
Please mark my post as SOLVED if it has resolved your problem. It helps others with similar situations.

Without main battery, CMOS checksum invalid.Doesn't keep time and BIOS settings. Backup batt is OK.

Good morning all,some months ago my dv6-6159sl laptop started to have this problem: WITHOUT MAIN BATTERY (using as desktop replacement with AC adapter only, unplugging from wall outlet when I don't use it) immediatly after power on button pressed, I get black screen error" CMOS Checksum is invalid . CMOS reset (502) . " and it restarts with all BIOS settings reset and time reset at 00:00:00 year 2010... The problem appears randomly: for days I don't get it, then I get it once, twice...then everything OK for one, two, many days...and again shows up...and so on... NOTE THAT BACKUP BATTERY CR2032 HAS BEEN REPLACED TWICE (for being sure) AND IS BRAND NEW, AND IS OK: A VOLTMETER SAYS 3,03 V . Tried to update BIOS to last F1.B , tried to revert back to F1.A and previous version (that is: I tried every single available BIOS on support page...)... No luck...Tried to recover BIOS with this procedure: http://support.hp.com/us-en/document/c04126730 ... nothing changed...Tried to recover whole system...Nothing fixed... Notes: hardware hasn't changed , HDD and RAM are OK (tests done). What to do now? Call for repair? Thanks.

Hello , Welcome to the HP Support Forums! It is a great place to find the help you need, both from other users, HP experts and other support personnel. I read your post about the BIOS, and wanted to assist you! Here are a few things you can try. Start with a Hard Reset. Then try using the HP Support Assistant to install any necessary drivers. Check the Windows Update as well. If you are having trouble finding or installing updates, then you can use this site to help: Open the Windows Update troubleshooter
You can always perform a System Recovery to put the notebook back to its factory settings. Also, please review the following document, as it may help to resolve the issue for you: HP PCs - HP BIOS Application Selected Is Corrupt or Missing If you are still having trouble, or would like to contact HP Phone Support, you can do so with the following link: http://www.hp.com/contacthp If you live outside the US/Canada, please click the link below to get the contact information for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html Please let me know if this information was helpful by clicking the thumbs up below.
Have a great day!

A57 9702-7UG Cmos checksum bad

Hi
someone can help me ?
after BIOS Update i'd get this message at boot
CMOS checksum bad
press F2 to resume or F1 to setup
after pressing F2
boot sequence error
Thinkcentre A57-97027UG
BIOS 51KT58AUS
I have already changed the batteri and make a procedure for set up and press F10 to save it
thanks for all

Hi all
Pushing up this topic.
We got the same issue on two A57 9704-7KG after System Update. It think a BIOS update was there as well.
We've also changed the batteries but the BIOS won't save the settings.
Is there any possibility to fix that or bring back the previous BIOS version?
Thanks for any help.
Andy

CMOS Checksum Bad ...

Howdy chaps,
Got my K8N Diamond Plus today, first thing it said when I booted up a new rig with it was:
CMOS Checksum bad - Press F1 to setup or F2 to load default values.
I pressed F2, everything has since worked fine. But of note, whenever I reset the CMOS, it goes back to that and I need to press F2 once more.
Did anyone else have this issue? Is my battery dying? Do I need to send this bad boy back to ZipZoomFly?

Quote from: syar2003 on 26-January-06, 02:02:49
What's so hard to understand .
clear cmos erases it/all data , no valid checksum exist after this .
cmos is then loaded with bios defaults from the bios chip , but checksum is still not valid until cmos is saved .
Only way to get valid checksum again it to save cmos settings from the "cmos setup menu" .
bios and cmos is two different things . cmos resides in the nvidia chipset .
But why didn't I get the same error message on an A8N32-SLI? Do Asus just hide it, or automatically load defaults upon resetting the CMOS..?

K9VGM-V motherboard for AM2 BIOS ROM checksum error

Hi everyone, i need some help about my comp.
When i turn on the computer, it just show
BIOS ROM checksum error
Detecting floppy drive A media
INSERT SYSTEM DISK AND PRESS ENTER
When i insert the boot disket, it just apper to show
INSERT SYSTEM DISK AND PRESS ENTER all the time.
Is there something wrong with the boot disk ?
I also insert the award flash program and recent BIOS for my board in the disk,
but it do not work.
At the top of the screen it show
AWARD BOOTBLOCK V1.0
I also try to reset the bios by the jumper, remove the battery and reinstall all the component attach to it.
It dont work either.
Please, i need some help now.

Read Moan Guide 1st.
That message suddenly arrive when you turn ON PC? (You haven't tryed to flash BIOS or something? )
Remove power cord from the PSU then leave one memory stick only in 1st DIMM near to CPU socket and do Clear CMOS
Retry to boot.

Cmos checksum error

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