Hi, and thanks for the quick response.
I've already tried resetting the BIOS, via the rear button and battery removal.
Here's the weird thing. If I try to go back to an older BIOS (B18 or FF) using Q-Flash, I get a "File size incorrect" message. If I boot to DOS and use FLASHSPI.EXE I get a "!!! Bad BIOS Image !!!" message. I've tried downloading from multiple servers just to make sure it isn't a corrupt BIOS from gigabyte.
The beta FF8, however, will reinstall just fine. FF8 is a 2Mb file, but all the older ones are 1Mb, which I suspect is the root cause of the problems.
I actually think the BIOS (therefore the motherboard) is trashed.
PS - I'm extremely experienced with PC hardware, so it's not a 'user' issue.