Upon booting my system after an MSI bios flash upgrade (3.0 to 3.1) I now get the message that my CMOS checksum is bad. I can hit F1 to continue or F2 to restore my defaults. I have removed my CMOS battery for several minutes and replaced it. That didn't work. I also moved my JBAT jumpers from 1&2 to 2&3 and returned to 1&2 - that didn't work. What else - short of taking my system to a repair shop - can I try to get rid of this error?
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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.
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.
Bad checksum and bad cmos message signal that the chip in which the BIOS is stored has failed. This chip cannot be repaired or replaced, and since it's soldered on the motherboard it means that it is also dead.
Time for a new motherboard.
A BIOS checksum error is most likely caused by a flat BIOS battery.
Replace the battery with a new one (it is usually a coin size battery - type CR2032) and then boot up and go to the BIOS configuration and set the Date & Time setting etc.
Make sure the battery your using is brand new. If it is then go ahead and get into the Bios and make sure the date and time is set properly. Once you do that then go ahead and save the changes and exit.
After this go ahead and see if the CMOS exit checksum defaults comes up if not then go ahead and turn off the computer and unplug it. Then after about 5 minutues plug the computer back up and turn it on and if the message doesn't come up then its resolved.
If the cmos checksum error comes back up then try a brand new battery, should be a 2032 battery and then go thru the same steps in setting the date and time and save changes and exit and if the message doesn't come back then unplug the system again and leave it unplugged for 5 minutes. Now plug it back up and if the message stays away the problem is resolved. it the message comes back then that means the motherboard isn't reconizing the batteries and the motherboard would need to be replaced.
Open Your system and there is a Battery which looks like a Coin. that is CMOS Battery (CR2032) Change that battery and then Reboot your system and try go to BIOS menu with DEL , F11 , F1 or F2. Either of these Buttons can Work.
I had a similar experience after upgrading my RAM. When you reset your CMOS and have default settings maybe you should check if your RAM timings are correct. I could not get mine to load with both sticks in until I fixed the timings from the default settings.
BOOT BLOCK COMPATIBLE VERSION VER .005 BAD BIOS CHECKSUM CHECKING FOR CD ROM READING FILE "P5SD2VM.ROM" READING FILE "P5SD2VM.ROM" READING FILE "P5SD2VM.ROM" READING FILE "P5SD2VM.ROM" READING FILE "P5SD2VM.ROM" NO CD-ROM FOUND CHECKING FOR FLOPPY DISK READING FILE "P5SD2VM.ROM" READING FILE "P5SD2VM.ROM" READING FILE "P5SD2VM.ROM" READING FILE "P5SD2VM.ROM" READING FILE "P5SD2VM.ROM" NO FLOPPY DISK FOUND