Why is my phone screen going crazy

my phone screen keeps going crazy

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Is the screen cracked? Have you tried cleaning the screen? What is the history of this phone?

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my phone has a crack on the bottom left corner. Its been working fine until a few minutes ago. I checked it and the entire left side of the screen is..colorful? That's how I would describe it. And the right side is normal except I cant click anything. Do u know how I could fix it?

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