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second monitor goes blank

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Joined
Sep 12, 2018
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5
Motherboard
GA-Z170-HD3P
CPU
i7-6700
Graphics
HD530
Mobile Phone
  1. iOS
Hi,
I changed motherboard and cpu to my system and managed to boot the old 10.14.6 build.
What I haven't be able to fix is a dual monitor issue: while booting, the second monitor goes blank and I need to unplug and replug both displays to make them turn on as aspected.
I was hoping to fix the issue following this guide https://www.tonymacx86.com/threads/...ching-guide-hdmi-black-screen-problem.269149/ but I couldn't succeede. Any hints? Thank you.
 
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