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HP Pavilion Gaming - 15-ec1051ax

Hello, So my booted  laptop's displays turned into black screen (98%) as soon I changed my hd from 60hz to 144hz. Btw 2% screen from top is visible, and it's working absolutely fine. Also when I connect external monitor, laptops displays starts working again, absolutely fine. But as soon as I disconnect the HDMI, the laptop's display again turns to black screen(98%). Can someone help me solve the issue?

 

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