there is nothing to fix, since this is not a breakdown, but you need to insert a monitor emulator as always, it's time to know this since you have been since 2014
From 2014 to 2016 i had a Sapp 7950/280x farm..
2016 to present Aorus 1070's .. No need for vga plugs, no unstable drivers.. and profitable mining until today (eth 30mhs/125w). Not a single regret being on the green side.
But 5700xt's are worth a try and i got a nice deal on Asrock Taichis.
back to the subject..
I used a VGA/DVI adapter with some resistors back then, whats used nowadays in the digital connectors for monitor emulator??
thanks for your answer!