I think they advertised these MB as having a dual bios, I think you can recover the original bios if you have the Motherboard's Original CD. Best bet is to look at the FAQ on Gigabytes website. Worst case scenario, you have to order a new bios chip. Don't give up, post if you find an easy fix please. Thanks.
Manual says press Del key during startup and then F8 to restore failed bios. Not sure if this is in your particular motherboard as their naming schedule is drop dead stupid and some of these versions have dual bios and some don't.
K8N, K8N-SLI, K8nXP-SLI, K8N-Ultra, K8n-Pro http://america.giga-byte.com/FileList/Manual/motherboar...(pro)(ultra)-sli_e.pdf Tech support numbers at the bottom of pdf if necessary. Good Luck!