Alienware Laptop has vertical flickering pixels across the screen

My screen is acting up with vertical flickering pixels. It seems to affect certain shades of colors. When I change the refresh rate of the screen to 40 Hertz the screen has a different pattern of flickering. I am not sure why this is happening all of a sudden or what to fix/replace. I have already taken it to a computer shop but they were no help at all.  How can I fix this?

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