My Pc constantly has an issue where playing certain games it will just randomly say Display Port no signal. The pc lights will still be on and there is still audio but on visuals. This usually happens when its an especially taxing game. Not sure if my GPU is just broken or what.
Check your GPU temperature while Playing games, may be overheating issue of the GPU.
if the temperature are getting above 80 or so, just check your GPU fans working or reinstall the thermal paste on your GPU