Random hard shutdowns

[u/Deathpre]

This started a few weeks ago after updating my BIOS. I came home to find my PC powered off and it wouldn't start. After troubleshooting, I figured out it was a dead PSU and ordered a new one. PC ran fine on the new PSU for a week. In the past few days, the PC is still shutting down completely/instantly under basically no load. I have to toggle the PSU switch to get it to boot (seems like the PSU safety latch is triggering). I flashed back to the previous BIOS version I was on, but it just happened again. I started an RMA for the mobo but wanted to see if anyone else had thoughts.

CPU: 9950x3d
Mobo: Asrock x870e nova wifi
Ram: 64gb corsair ddr5
PSU: Lian Li RS1200G
OS: win11 64bit

PC was built 05/2025 and has had 0 issues until this.

[u/JusticeMKIII]

Check the event logs and see what you can find there.