second monitor randomly goes black?

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

Possible reasons for the screen to go black are: Damaged HDMI/VGA port, Malfunctioned Cable, Loose ports. So suppose if your dell monitor goes black randomly then you should first check if cables are tightly fit into ports. If it is fine then check if cables are in working condition by testing them on other devices.

My second monitor is working but black screen(HDMI)

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