I found this thread by luck. Too bad there is no solution :(. I'm having the same issue described here, I'm running a 4930k with a Asus Rampage black edition X79.
I recently upgraded to a RTX2080 founders edition from a GTX980 and also purchased a Corsair h115i pro the same day after installing everything and starting up my fist game I got the black screen about an hour into game play, dealt with it for about a week before I called Nvidia (got the card from a friend) and after troubleshooting with them they okay'ed for an RMA. I installed the 980 back and everything was great, get the card two weeks later installed it and black screen again. After that I'm starting to think there has to be something else happening after searching for a few hours for solutions I stumble across this thread, I had no Idea this had been going on for so long and being ignored.
I guess I'm stuck with a brand new card I can't use for now.