This is a not big problem.when u see,worning: main bios shecksum error ..
Recovary from hpa... Then u take your motherbord cd.and put them.if dos not work.u can find website and download bios driver.and need a bootebol usb pendriver.it is make format fat32 from any compeuter and then put in bios data.make the pendriveb of rename "fast boot.and put in a usb solart then pres powar baton of pc.is work and u will wate 7 to 10 minits.lets u can see open your pc.
Try to find a copy of the bios from the manufacture's website, and put it on a usb stick, then start the computer with the usb stick plugged in. if that doesn't work, you may have to replace the bios chip with a properly programmed one. if you can replace it, then you would have to replace your motherboard (unless I missing something here on how to recover the bios)
SOURCE: Mainboard GA-G31-ES2C Warning: Backup BIOS checksum
If you have reset the CMOS memory you need to go into the BIOS setup screen and reconfigure the BIOS. To do that you need to press a key while the computer is booting. Usually F2 but can be other keys. It should tell you on the bottom of the first screen which key to press to enter BIOS setup.
If you don't know the settings the should be one for optimal defaults - use that one. You will also need to reset the time and date.
Save, Exit and re-boot and everything should then work.
During the boot process you will see on the screen to press delete to enter setup
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