I'm actually literally have the same problems this guy is having. I managed to boot up my computer before it could go to the green screen and have enough time to remove the drivers from the Device Manager and everything is running perfectly fine. The issue has to be some drivers and amd needs to fix this because it's not the card.
Except in the OPS case, the computer wouldn't even boot up with the bad card in. Without the card the computer starts to boot up.
Your case is different then his in that respect. Your computer still boots up with the GPU card installed his doesn't.
it did initially but then it stopped entirely. I don't know if the glitch with the driver could have caused a physical problem or damaged the firmware but its hard to tell since I cant really troubleshoot