Question My pc keeps crashing...

Mar 28, 2020
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Okay so I just build my new PC and there is a 2080 Ti in it and for some reason when I try to play games that require a little more it randomly crashes. I’ve tested it with the heaven benchmark. And it crashed 12 out of 12 times then I got a new graphics card the same one just a new one and then I did the same thing and now I saw that the fans are not even turning around the graphics card is working but the fans are not turning??? I’ll try to replace the power which is a 750 and the crash still happens I’ve tried to replace the CPU and I’ll try to replace the cooler and I’m kind of confused what to do now the PC still crashes when I run a benchmark??? Is someone little bit more clever than me it’s what is this?? I’ve already really tried to reinstall windows and that didn’t make a difference. - Other thing is when I try to put a 1650 graphics card in The benchmark worked for two hours without anything and I just got a new graphics card from the place I bought it from??! Does anyone have any ideas what to do now like I said the fans on the 2080 Ti doesn’t turn around?? Could it have something to do with the power supply not being big enough or what please tell me your suggestions! :(