monitor on my PC keeps turning off and on intermittently. Through a process of elimination I have worked out it's not the cables or the monitor

[Microsoft Windows]

I have two monitors attached to my PC, one keeps turning off and on intermittently. Through a process of elimination I have worked out it's not the cables or the monitor as I switched over and it still keeps happening. I even bought knew cables and connected as HDMI where as before it was DVI

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