my monitor get's a black screen except a tiny bit at top

[Nicho Kurniawan]

so um couple of weeks ago my 144hz monitor start having like a white flicker horizontal line on top but by changing the hertz to 137 the flicker go away but then yesterday the white flicker starts appearing again at 137HZ then i try changing to 144hz again then it becomes like this

View: https://youtube.com/shorts/_0oYC2L5Eck
, is there any solution to this or my monitor already broken?

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