This exact same thing happened to me with an Asus m4a88td-v evo usb3 mobo. Don't get into BIOS setup, whatever I try. I'll send it back today and ordered a new one. Hopefully this will work, if not I don't buy Asus anymore. It is a pain in the ass assembling the whole computer to find out that it doesn't work, deassemble and then ship it back. To much hustle you ask me!