Secondary display detected, but no output to it

Hey!

I have an issue with my hackintosh where I have a second monitor connected to it, and MacOS detects it any all that without a problem, but there is no image output on the display. It only shows a black screen. Any ideas?

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My setup is as follows if needed:

i7-6700k in a MSI z170a-Gaming-M7 motherboard

AMD Radeon R9-390

If you need more info, let me know!