The boot screen showed up as normal and loaded into Windows, but as soon as Windows loaded the screen flickered coloured snow and went into power saving mode. I then moved it to my normal desk and plugged it into my normal gaming monitor (a Kogan KALED24144F, off brand 1080p 144Hz FreeSync monitor) via the same DisplayPort cable I have always used with the old Graphics Card and booted.
I installed the card, cleared the NVIDIA drivers with DDU and installed the Radeon software using a HDMI monitor I have in my kitchen.
Yesterday I got my Red Devil 5700 XT to upgrade from my GTX 1060 6GB.