RX 480 Fails to boot after kext edit!

[The11thDoctor28]

I've built up my hackintosh, but have not been able to get my 480 to properly work.
After editing the kext files Sierra will no longer boot up.
Setting the primary GPU to the iGPU reveals a glitchy top left of the screen.
However if I unplug the power source from my 480 and leave it in I just get a black screen.

Any boot flags I could use?

PLEASE HELP!
and please be patient with my lack of knowledge.

 

[BreBo]

@The11thDoctor28, please update your profile (personal details) with your build (Motherboard, CPU and Graphics Card).

Profiles need to contain at least your primary system to assist others with helping you.