GRUB loader will not start after bios upgrade

Hello, I upgraded my Gigabyte K8VT800 Pro board to F10 bios. But with the F10 bios the GRUB Linux boot loader will not start. The GRUB version is 0.94. GRUB only loads a consol with GRUB> where I can type some commands. I would like to use the F10 bios because of C'n'Q is automaticaly enabled e.g. when I'm in bios the CPU vcore is only 1.1V. Any ideas? Thanks, Moritz