Dangit. Kicked my miniPC as I stretched and its fan went haywire. Popped out the power cable and put it back in a bit. System seems back online and temps are holding (+53.0°C). Noise is no longer present.
What else can I check to see that I didn't damage the little one? I'm running way too many services on this one to sleep peacefully - n8n, freshrss, minio, linkding, memos, kokoro, and my tailscale entrypoint into my home network!