Computer crashing shortly after startup

[Windows 11]

As the title says, I have a new computer that is crashing almost every time I turn it on. It usually happens in the first few minutes after start up and usually only happens once. If I start any gaming, or even try to watch you tube, I either get a black screen and restart or at times a blue screen saying my pc has ran into problems and needs to restart. My daughter also has regular crashing playing Fortnite with her friends but the computer does not restart completely in these cases.

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