Question pc "crashed" and I dont know why

Aug 1, 2019
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I recently asked for help in this post : https://forums.tomshardware.com/thr...l-and-is-my-power-button-not-working.3507421/ , and the problem described here was fixed, I think. that exact scenario hasn't happened again (,where I start it up and it does that), but I just came home and my yt video stuttered a bit sometimes, until it stuttered like crazy and my monitors didn't get any signal anymore and my keyboard/mouse leds were turned off, but my pc was still on. fans were s[pinning and mobo leds were still on. As described in my previous post: my power button also didn't work so I turned it off by turning off the psu. I am pretty scared that I did something wrong while building it, because this kind of situation has now happened three times. See post linked above for more info.

Thanks in advance.