A checksum is a redundancy check during the startup process of the board, which makes sure that a bios' data is intact and unhampered. The data is scanned and tested for accuracy, either based on how well it relates to data elsewhere or based on previous data that was stored on the CMOS chip. 

This will occur if you have just flashed the BIOS, removed the CMOS battery, or made a hardware change since last boot. If you have not flashed your BIOS, removed the battery, or added/removed a piece of hardware it may indicate a bad component or weak CMOS battery. You can clear the error by pressing F1. Next reboot the computer and see if the same error comes up. If it does enter the BIOS, load defaults, then hit F10 to save and exit. If you still get the error

Go into the BIOS and look for the following menu:

• x58 - PC Health Status
• SR2 & P55 - Hardware Health Configuration
• 6/7 Series - System Monitor

If the VBAT is below 3.1V you may need to have it replaced. The battery model is a CR2032 lithium battery.

If the VBAT is 3.1v or above it should not be losing settings. You may have a ground fault. Test the system with 1 stick of memory, 1 graphics card, and the CPU. Disconnect any front panel connectors, SATA cables, USB headers, fan headers (except the CPU fan) and test again. Next try taking the motherboard outside of the case and testing it on a non-conductive surface. If none of the above steps have solved the problem please contact us directly so we can further assist you.