Causes of CMOS Checksum Bad Errors
There are 3 main reasons that cause a CMOS Checksum Bad Error:
• CMOS Battery malfunctioning
• Your BIOS has been updated (possibly a virus)
• The computer was shut down improperly (MS
Windows requires you to shut down your computer before shutting off the power).
Here are some remedies for each situation:
CMOS Battery Not Functioning Properly: If your CMOS battery is not functioning properly change it. Go into your CMOS and write down all of the settings. If you loose them you can also get them from your computer manufacturer. Locate the battery and remove it (consult your computers manual or tech support). Once you have your new battery, you can replace it and reenter your CMOS settings.
Your BIOS has Been Updated: Your CMOS settings may have become reset. Make sure that the values entered in the BIOS are correct and reset them to the default settings. Run a virus scan and make sure that the BIOS settings are back to the default.
The Computer Was Shut Down Improperly: Running MS Windows, if you shut down your laptop or desktop without shutting down your operating system first, it will corrupt the CMOS settings and cause the CMOS Checksum Bad Error.
Avoid this error by completely shutting down your computer before turning off the power.
