Earlier today I was in multiplayer, I do not remember what I was doing at the time.But just now, I had a serious crash(in multiplayer for about an hour), I was about to fly under a bridge near Hilo to get to an aerocache, I hit the bridge, started the crash cinematic and then shortly after, my computer shut off in a way that pushing the power button to turn it back on didnt work. But i did try unplugging the psu, letting whatever electric charge inside die out, and then plugging it back in helped.Has this happened to anyone else?

Yes, this is expected when you crash at over 400 knots. :Just Kidding:Just kidding, of course, but I don't think this was related to the game directly.. Maybe the PSU wasn't par with the resources needed by your PC?

Yeah I doubt was related to the game at all , but who knows. You may have had a power spike or blip that caused your system to shut down like that.

If possible check if there's a significant dust build-up inside your machine. Once I had a very similar problem due to this issue.The power spike option is relatively unlikely, but definitely possible.

Just shooting in the dark here but from my experiences with computers it sounds like a GPU failure...i've had a few of those over the years with similar consequences. Nothing a simple power restart wouldn't fix though. Hope it's nothing serious!