Black Display!

I’m having a difficulty with my Xbox One X I cleaned the followers and adjusted the thermal paste, I adopted a video on Youtube and all the pieces went properly, the second I linked it to play after a couple of minute’s enjoying the display turns black and “disconnects” from the hdmi, and goes on once more. I can’t discover any resolution on the net and I need assistance, if any of you recognize what the difficulty is and know the best way to resolve it remark please. Thanks