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Screen not working after casing replacement

I changed my macbook pro house cover, after changing it, my screen wont turn on, also the apple logo wont light on. I heard the computer turn on but the screen doesnt light on. the keyboard wont light on too.

Please help me. What did I do wrong?

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Hook it up to an external monitor to try to isolate the problem. A history might help us, why did you replace the case? Which case was replaced? Did it operate before you replaced the case?

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