Question PC was working fine, randomly turned off and only turns back on for a split second before turning back off.

Nov 28, 2020
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this is a brand new pc, just built a few days ago
So today I was playing perfectly fine for hours, switched games and went to play some modern warfare with the boys. All of a sudden, my pc shut down. I figured it had overheated or something so i gave it some time to cool off, but upon pressing the power button, the led's turn on and the fans spin for no longer than half a second before turning off again. I've tried numerous things, browsed many forums. I'm starting to wonder if it's possible I received a faulty psu. Any suggestions?