How to fix "CMOS Checksum Bad"

CMOS Checksum Bad is usually cause by the CMOS Battery drying up. You'll notice that your bios setting don't save anymore and your clock resets everytime you turn on your computer. To fix this, follow the steps below.

1. Remove every power connection from your Power Supply to your Motherboard (usually two connections for most motherboards).


2. Remove the CMOS Battery located inside the motherboard.


3. Remove the CMOS Battery jumper. This one is usually located near the battery.


4. Wait for 15 minutes for the computer to discharge. If you're in a hurry, 3 minutes will do.


5. Now plug in back everything. Make sure you plug in a new CMOS Battery and not the old one.


6.  Turn on the computer, set the bios settings, set up the clock, and turn off the computer and remove the plug from the power sources.


7. Wait for a few minutes for the computer to discharge. Now turn it on and see if the "CMOS Checksum Bad" message does not appear anymore.


8. If you've done all of this right, congratulations, you have fixed your computer.