For those that don't know, it's unplug all HDMI ports, power off the monitor/tv and PC, remove AC cables for about 5 minutes, reconnect and retest.
I did not write about video settings. You must know that area back and forth, up and down, top to bottom, to infinity and beyond.
I've got three computers hooked to the three ports on my monitor. The one hooked to HDMI will show for a few seconds, then go black. The others work fine, though the analog port did the same thing a few times then started working fine. Digital port never showed a problem. I have checked the connections.

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