Hi I have installed a brand new Gigabyte GA-870A-USB3L motherboard for my dad and it has been working for the last few weeks until today, he tells me that a Bad CheckSum error appeared on the BIOS when he rebooted his computer. I have completely powered down the computer and powered it back up but no error on BIOS. Would the battery be the issue but the time and date are still set correctly. The CPU is out of an Packard Bell iMedia S3210i as i think i can see a lightbrown mark on the cpu socket itself. The RAM is brand new out of the packaging. The Hard drive is out of the old computer which works fine as no problems with Windows 7. The DVD-ROM is out of the Packard Bell machine aswell. What could be the cause of the error?