I flashed the card with a Coldslow BIOS and benched the card without problems. I flashed the original back (already back to stock volts, stock cooler) and got a flickering red screen. After a bit, I got what you see in the picture.

 

I have no idea what went wrong and i've never seen a problem like this, despite all the times i've flashed a GPU BIOS.

 

Any and all advice & fixes welcome. It's from a Gigabyte non-ref GTX470.

Have you tried deleting the bios first and then flashing again?

How can I delete a GPU BIOS?

Did you try forcing the flash? -4 -5 -6? I also think -9 or -e command erases the old bios. Its been a while since I've used NVFlash

I believe I once erased a bios when I had the 7970 matrix for review, before I could flash another bios, or else it would just refuse to work properly. Not sure how this is done on Nvidia.