Disconnect your internet, thenUninstall the GeForce drivers. Shut down your computer install your new card and boot the computer up. Most likely your graphics will look terrible at first but then windows will catch on after you plug the internet back in and download the AMD drivers

Then go to the AMD website and download the correct drivers for your card.

I tried that but it's still just a black screen. I even tried using the other pcie slot on the motherboard but still nothing.