![]() ![]() When you see this, it is an obvious indication that you have a weak CMOS battery. Also you will notice, when you have the CMOS Checksum Bad error, you will also see an error with the date and time saying it is not set. System CMOS checksum bad - default configuration used - this is an error message Im receiving when trying to boot - but it doesnt happen all the time. If the values match, the computer boots normally. Enter CMOS setup, re-enter all values, and then save and exit the CMOS setup. If a BIOS update was run on the computer, the values stored in CMOS are reset. When there is a mismatch on the values, the CMOS Checksum Bad error appears. If the CMOS values are corrupt, enter the correct values in CMOS setup, and then save and exit the CMOS setup to resolve your issues. Since the checksum or the error detecting code that protects the BIOS configurations is stored in the CMOS memory, this value is verified against the stored value in the CMOS memory every time the computer boots. The error appears when the values don’t match. The term checksum in the error message refers to the error detecting code that protects the BIOS settings or configurations that are stored in the CMOS memory. With my experience, I have never encountered a virus so strong that it managed to modify the BIOS information on the CPU. Another possible cause of the error is a bad BIOS update or when a virus updated the BIOS. The error normally appears right after you turn on your CPU. I just fix the main issue on the computer first and just go back to the CMOS error when I’m finished where I only ask the owner to buy a new CMOS battery so I can replace the one installed on the motherboard.Īnd as soon as I installed a fresh battery, the CMOS Checksum Bad error disappears when booting. In my case, since I also fix computers, every time I encounter this error I often ignore it.īecause I know, it is a problem with the battery or the CMOS battery. ![]() Fortunately, this is an error that can easily be fixed so you don’t have to worry anything about. Consult the computer manual or technical support to remove your battery (the battery is flat, shiny silver colored, and coin-shaped) if needed. To replace the battery yourself, follow the instructions below: Place the controller on a table, hard drive side down. The CMOS Checksum Bad error is a pretty common error that users often encounter just like me. This will just leave the cmos 'as is' with the bad checksum. ![]()
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