why does my screen go black for a second?

Windows 10 Randomly Black Screen Error Fixed | Monitor Goes Black[Solved]

Reevaluate The Cables HDMI, VGA, DVI, and other video display controllers transfer video and/or audio signals. If these signals can’t make their way to the monitor, your screen will go black. That may be because you’re using a splitter, a cable that’s too thin or long, or simply a cheap one.

My second monitor is working but black screen(HDMI)

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