I recently updated the BIOS on my Gigabyte motherboard Z68X-UD3H-B3 (Rev. 1.3) from F12 to U1n, which is UEFI. The flash seemed to go as it should, however, whenever I try to access UEFI, I get the UEFI Dual BIOS screen, but no menu. It's just a frozen screen with no keyboard or mouse response...