That's nothing!
I have a Gigabyte MB that is advertised with dual BIOS safe option (if 1 BIOS chip fails, after reboot, BIOS is read from second chip). And on my MB, both chips failed... At the same time.
I have returned about 20 gigbyte g41 boards for that reasson:P too. If you guys are wondering the symptom the vga goes dead then if you reboot it it will not return.
But still not too bad to lose 20 out of about 300ish boards that were in use at the time for 5+ years.
Since BIOS does a grand total of precisely nothing once a PC boots, it shouldn't affect VGA at all - so that seems to be an unlikely source of that particular failure mode.
Fun tip: An old desperation way to flash a new bios chip was to pull the chip out of a running system, plug in the blank one, run a flash, and then swap the chips back. Once booted, the PC doesn't care if you yank the bios. Many people seem to be under the impression that the BIOS chip is some sort of processor - it isn't. It's just CMOS memory. Its loaded into processor memory once, at boot up, and that's it. If your system fails while in use the bios chip wasn't the problem.
The one time I seriously suspected a bios chip failure, I had it replaced and the system still woudn't POST. Turned out to be a faulty PCI card. Always remove all unneeded components when troubleshooting, and replace them one by one - saves a lot of headache.
As to the dual bios thing not protecting against bad flashes - I haven't had a gigabyte board in a while, but I seem to remember it doing exactly that. It would never flash both chips at once, and if one failed to boot it would automatically fail over to the other. The second chip was a backup of a known good flash. In fact, protecting against bad flash is exactly what gigabyte markets it as doing!
People blame the BIOS for everything because they don't know what the real failure was and they just repeat something they heard someone else say. You see the same thing with cars - people will blame problems on all sorts of things when they don't know what's wrong - they're just repeating what they heard someone else blame problems on.