Question Random Shutdowns without warning - No BSOD, PSU Lockout, Fully Reinstalled System

[Karlsson_H3]

Hey everyone,​

Pardon if this is the wrong place to put this but here it goes!
I'm experiencing a weird and persistent issue with my desktop, it randomly shuts off as if someone pulled the plug, just instantly powers off.
After that, I am unable to restart until I power cycle the PSU. Then it boots just fine, runs for a while and eventually shuts down again. Sometimes during a game, loading of a game (hates Cities Skylines 2 menu?), watching a movie or sometimes even just staring at the desktop without much more than Spotify and Discord running. So, no consistent load pattern...

System specs:​

• Ryzen 7 5800X3D
• EVGA RTX 3070 XC3 ULTRA* not the FTW
• ASUS ROG STRIX x470-F GAMING
• 4x8GB 3600 MHz CL18 (changing these around made no difference, nor did running with two sticks (neither pair))
• 2 M.2 drives (No signs of wear, SMART OK)
• 4TB HDD (mostly idle / spun down) SMART OK
• Corsair Vengeance 750M PSU
• Newly installed Windows 11 Pro, fully updated and reflashed BIOS

I've tried:​

• Full Windows reinstall
• Formatted ALL drives
• Updated BIOS
• Cleared CMOS
• No OC or DOCP
• Plugged directly into the wall + different breaker
• Reseated ALL power cables + GPU
• Checked all fans and temperatures and everything is fine! Even PSU fan is spinning...
• Stresstest via OCCT while logging sensors via HWiNFO
  • CPU peaks at 146 W or 125 W by my PBO settings
  • GPU draws 250+ W without the slot being ¿overwhelmed? and the two 8-pin having the draw evenly distributed
  • No shutdown occurred during these tests, this time. However after running one stresstest it did crash 5 minutes later, on the desktop
• Changed the PSU from Multi-rail to Single-rail
• Can't see anything burnt on any part (except PSU, difficult to check that one) or smell anything funny.

It's been running fine for roughly 1,5 years so I haven't brought myself to reseat the CPU, can't believe that would be the culprit.
Through the logged data I found the 12V rail moving +/- 1.4%, 5V moving at most 0.11V and 3.3V staying between 3.335-3.357V.
Same goes for the voltage reported by the PCIe slot with a variance of 2.4%

Event Viewer shows the generic Event 41 and 6008 stating "The system had rebooted without cleanly shutting down first." and "The previous shutdown at xx:xx was unexpected." Minidumps are never generated either, the shutdown is just too abrupt.

Anyone with experience of these PSU lockout shutdowns? I'm stuck and would appreciate any feedback and ideas as my natural next step is to try and start swapping part by part, but that isn't exactly easy without parts on hand.

 

[Lutfij]

Welcome to the forums, newcomer!

Corsair Vengeance 750M PSU
How old is the PSU?

Changed the PSU from Multi-rail to Single-rail
Please elaborate.

Please elaborate what you mean by this;
After that, I am unable to restart until I power cycle the PSU.
Do you mean that you need to turn the rocker switch on the PSU(or the wall outlet) from On to Off and then back on again?

You might want to source a reliably built 850(or higher)W PSU and see if the issue persists. The RTX 3000 series did have a high transient load spike issue;

View: https://www.youtube.com/watch?v=wnRyyCsuHFQ

 

[Karlsson_H3]

Thank you!

How old is the PSU?
January 2020

Changed the PSU from Multi-rail to Single-rail
Grabbed from Corsairs website:

+12V MULTI-RAIL DESIGN
VENGEANCE Series™ feature a switchable single/multi-rail +12V design, allowing you to choose from the convenience of a single rail or the added Over Current Protection (OCP) of a multi-rail design at the flick of a switch.

Simply just a switch on the inside that lets you select from what I assume, higher tolerance for spikes using one rail, or more sensitive OCP using multiple, don't quote me on that. Didn't make a noticeable difference either way.

Power cycle the PSU
I have to flip off the rocker on the back (or unplug it), hold the power on button until all lights turn off (those being LEDs on the motherboard and the Ethernet lights), then flick the rocker back on and power on the system.

Could I just have been surfing the edge then for a year or two and finally the PSU has had enough of the beating? The system shutting down right when booting up Cities Skylines 2 (into the menu (it really just seems to hate that game?)) or being idle on the desktop doesn't add up to that conclusion though. Quite the pickle.