How do I get the screen back on

[Windows Server]

My screen won’t turn on, my mom bought me a laptop off amazon about 2 years ago now, the memory usage was a little high for my liking so I asked my little brother (who has a bit of experience with this topic) to clean up my laptop for me, he did but now the screen won’t turn on and I’m not sure what he did. What in the world am I supposed to do.

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