Screen flickering & horizontal lines at the bottom and top

Recently, my computer screen has been experiencing occasional flickering and permanent horizontal lines at the top and bottom. Despite my efforts to resolve the issue by replacing the HDMI cable, trying different ports, and reinstalling graphics and monitor drivers, the problem persists. I suspect a hardware issue but lack the expertise to diagnose it. Therefore, I would greatly appreciate any assistance in identifying and resolving the issue.

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My problem started the same way as the video above, latter completely unusable screen and than total darkness. It powers up, but no image.