New Gigabyte boards have a way of saving the current BIOS to an area of the harddrive you cannot access wgich is why formatting will have no effect. You need to enter the BIOS Q Flash utility and set it up to boot from the main BIOS not the backed up image,
Good Luck, Gigabyte boards already with problems, but I might have to agree with what the user said in the first link, saying that somebody might have been fiddling with the board before you got it, maybe the store you purchased it from were running a QA / Testing on it, to make sure boards work and forgot to revert back to some settings.
i've had my EP45T do this on occasion. i can't recall the exact fix but i think a CMOS clear with the CPU and battery out might have worked, or i put the driver CD in the optical drive and upon boot up it flashed the BIOS from the CD. i am thinking it is a corrupt BIOS or something has gone wonky with their "double BIOS".