MP 1,1-5,1 Problem with 5.1 and new graphic card Radeon RX560

[flatpack76]

Hello,

I replaced my Nvidia GT120 with a new gigabyte Radeon RX560 but I am having issues. Fans are running and the 5.1 starts normally but I am getting a black screen and my display keeps on saying , no input detected. I have a feeling the card is not mac-firmware . Actually it for sure isn’t.
Is it what might be causing the black screen?
And if so, is there a way to get it flashed?
Thank you very much for your help!

PS:
It’s a 5.1 with dual CPU running OS high sierra.

 

[sailorMH]

@flatpack76
maybe is better write your post to Mac/Desktop forum. It reads more people which have Mac Pro.

 

[flatpack76]

I have actually sorted it out with the help of a fellow Mac user on this forum. Thank you!
Just trying to install mojave now

 

[Cheekyrobot]

how? I am having the same black screen!!! please help