no video signal after restart mid. install

This is my first macIntosh install. I have not specifically build this pc for this purpose but I checked so all my hardware should be compatible. I am running a AsRock z77 extreme4 a i5 2500k and a gtx670. I tweaked my bios and managed to get macOS to load and try to perform an install. I wiped one of my ssd´s (I disconnected all others) and tried to install it. I do not get a video signal after macOs tries to restart to the OS. However the pc is running fine and even goes to Hibernate so I guess that is a problem with the video signal. I switched all my monitors around but still was not able to get one running. I read that you can lunch cover with specifiv boot flags but did not managed to change that? What can I do how do I get my screens to work again.

submitted by /u/calrissianlando
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