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I have: Intel Core i7 7700K 4.2 Ghz Gigabyte GA-Z270MX/Gaming 5 Samsung CF791 Series 34-Inch Curved Widescreen Monitor (C34F791) 3440x1440 4K Samsung U28E590D 28-Inch UHD LED-Lit Monitor with Freesync support 3840x2160 4K XFX AMD Radeon™ RX 580 8GB 256 Bit GDDR5 Graphics Card Both monitors are hooked up through Display Port Sierra works fine and I get full 4K off both monitors and everything works. However.... With High Sierra I can only boot into High Sierra with 1 of the monitors turned on. Whenever I turn on the 2 monitor everything freezes within High Sierra and screen goes gray. I can still see the desktop but can't click on anything. Anybody know what I can do to get both monitors working fully in 4K? Some Success ------------- After 2 days of constant testing with no luck. I think the problem has something to do with the AMD .kexts in S/L/E. When I copied the AMD .kexts from Sierra to High Sierra I got weird colors (red & blues flipped) and the 2nd monitor will go on and not lock up the computer Even though the method of copying kexts somewhat worked... It made the graphics choppy and everything was running slow (open windows and programs). Is there a FakeID (FB Name, NVCAP, VRAM, Video Ports, Display-cfg, ig-platform-id, BootDisplay) of some sort I can use in Clover to fix this? Kext? My clover config is attached if that helps anybody! Also... The 2 pictures attached are what happens. Boots with 1 monitor on. As soon as the 2nd monitor is turned on or plugged in... The working monitor goes black and everything stops responding. config.plist.zip