PC keeps rebooting randomly, turning completely off the on again

May 22, 2018
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I just built a new PC and I will be able to use it just fine, but then all of a sudden 3-20 min later it reboots itself without warning. I checked for updates, turned off auto restart, reseated RAM, updated driver's one by one in device manager, tried one ram stick at a time, replugged the PSU and corresponding cords, but nothing seems to work. I have googled possible explain things but no suggestions have worked. I'm not very experienced at troubleshooting and I have no clue where to start. Please help

Thank you