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PC randomly restarts out of nowhere
(sh.itjust.works)
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this post was submitted on 21 May 2026
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If there are absolutely no errors in event log before the restart, PSU really is a top contender. The system will have had no warnings of any kind. If the PSU stops delivering adequate power, it's likely to restart, and this is at a low level (i.e. the motherboard restarts the system).
It's difficult to diagnose too. For mine, I was able to get more-or-less consistent restarts by requiring more PSU current by putting the system under heavier load. Once I saw the restarts occur as fans / drives / GPU were spooling up, I swapped my PSU. That was the issue.
The good news is that (well-made) PSUs usually fail in a way that won't damage components. And yes, even good PSUs can fail, especially if they're being used above their rating. And even the best PSUs don't last forever -- best practice to change them out every few years, in any event.