I have had this same exact problem, only when I disconnect everything and reconnect it, for around 30 seconds to a minute the screen comes back. At the start it’s a normal screen then it starts to flicker, then even more flickering for longer periods, eventually after a minute the whole screen goes black. I can still hear the sound though. Anyone got any ideas on how to fix this, I doubt it’s my HDMI port or cable as it’s new. My monitor works fine with my PC, but doesn’t work with my PS4 and my 0s4 works fine with my tv but not the monitor, anyone got any fixes?