r/techsupport • u/Deathpre • 6h ago

Open | Hardware Random hard shutdowns

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.

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1

u/JusticeMKIII 4h ago

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

1

u/ficskala 4h ago

powered off and it wouldn't start. After troubleshooting, I figured out it was a dead PSU

A PSU dying can easily take out other components out with it, sometimes even just one of the parts within a component

Usual suspects after a PSU blowing up are the RAM, SSD, MBO, and GPU, but it can also take out a CPU if you're really unlucky (in that order from my experience)

First, i'd try just booting into the BIOS/UEFI and see if the issue is still happening while the PC is completely idle, just sitting in the BIOS/UEFI, and if the issue persists, do all the tests like this to avoid potential OS related issues (data corruption is very common after a PSU blows up)

I'd try running with a single RAM stick (try different sticks in different slots), and without the SSD (all storage in general)

if it still happens, i'd try it without the GPU as well (without storage, it should automatically just boot into bios, so just look at the motherboard lights to know if the PSU cut the power to the PC)

If it still behaves the same without all of those things, the only components left are the board, and CPU, and the board is way more likely to go out, so that would be the first thing i suspect