Question Persistent black screen crashing on PC

Aug 8, 2020
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Hey all,
I just built my pc just over two months ago, and it's been working great up until a week ago when I started experiencing black screen crashes after about 20 minutes of usage. Even when just browsing the Internet, my pc will crash and go to a black screen. When this happens, my keyboard turns off, but the fans in my case remain on, same with all my other components. In order to get out of the black screen, I have to physically press the power button on my case. From what I've been able to gather, I think I may have a failing power supply, but I was hoping to get a second opinion on here.
Thanks!