Hi, I am trying to get a RX580 card working on a Mac Pro 3,1 with Mojave installed via DosDude1's methods. The previous card was a Nvidia 710 which ran perfectly. However, I need to drive a 4K monitor and the 710 only had HDMI 1.4. When trying to boot with the RX580 alone, the system appears to boot correctly and the screen comes on after about 30 seconds. But instead of seeing the login screen, it is just a black screen. The monitor stays on however so it is clearly getting some sort of signal from the card. I have also tried to boot with both the 710 and the RX580 installed. The monitor with the RX580 shows the same as before. The monitor with the 710 shows a black screen with a single white text cursor (i.e. white square) in the top left. However, the system does not responds to keyboard or mouse input. The RX580 card has been tested on another machine and it works fine. Any suggestions on what I am doing wrong? Thanks.