TL;DR: I can only see the image with one mlnitor connected, either HDMI or DisplayPort. The second one can be connected after system booting by plugging the cable into the GPU and the image will appear on it. If you try to cold turn on the PC with two monitors connected at once, there will be no image on either monitor
The only thing that helps is to enable CSM in UEFI.
But this is inconvenient for me, because then all booting will take place on a monitor connected via HDMI instead of DisplayPort, and also the boot screen will be in a terrible resolution.
I used all sorts of boot args in different combinations, which should have helped fix the black screen, also used WhateverGreen. I'm also aware of the connector patches, which I've also tried to do and it didn't work for me, although I may have done something wrong.
I have not been able to solve this problem for two weeks now — neither chatting with ChatGPT nor reading the relevant forums helps, I have tried many things.
I'm using High Sierra 10.13.6 and OpenCore.
I see verbose booting, but at some point, when the second stage of booting with apple logo should start, both screens go black, no signaling.
NVIDIA Web drivers are successfully installed and working, in general there are no problems with the monitors at all, they both work, but only if the second one is connected already after the system boot. Otherwise, I will observe black screens on both displays
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