do you have latest bios? flashing to latest may fix this: https://www.asus.com/us/Motherboards/M5A97_R20/HelpDesk_Download/
your motherboard appears to support: http://event.asus.com/2012/mb/USB_BIOS_Flashback_GUIDE/ so you can flash bios without needing to get into it.
otherwise you need to get motherboard looked at.