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It's a BIOS switch, so if you're one of those people who wants to monkey around with the BIOS and screw it up, you can switch to the second BIOS and fix your screwup.
Thanks, useful to know.
But no, I'm not. I don't even overclock.
I'd already put the thing back together again & tried it in both positions by the time the reply came in. Same result, Long beep & two short with both positions.
Decided not to bake it though. Going to try & find a 'proper' repairer - as long as it's cheaper to repair than buying a 'good enough' card (For Elite: Dangerous) 2nd hand (~£160) on fleabay it'll be well worth it.