What's wrong with my computer? How can I diagnose ?

[JustInABox6139]

My computer has problems like games it runs in pixel, such as Fortnite, it runs in pixels' and the fps a horrible , even discords game activity , and after a few seconds or a few minutes i get a blue screen, and when I turn on my computer it shows me a black screen and I have to force restart again and again to get a normal login interface , and also my night light doesnt work, and I don't have a sleep button. I know nothing about the technical side of computer, hope someone has answers.

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