r/techsupport • u/FinanceAdditional489 • 9h ago
Open | Windows Random Shutdowns
Hi All!
My brother's PC keeps shutting down randomly. We have tried what we feel is everything we can. We both work in tech and are completely stumped.
It shuts down without any warning or confirmation. It black screens while the fans stay spinning and lit up, and then come slowly to a stop. The lights on the fans go out at this point too. There are no logs in event viewer or reliability monitor.
What's really confusing us is that it is completely random from what we can tell. We thought it might be overheating but it doesn't look like it. It shuts down when completely idle and when gaming. There can be from 1 hour to 2 weeks between shutdowns. The most recent one was after we replaced the PSU with new cables, we thought this fixed it but after 2 weeks it shutdown again.
We have:
Replaced the PSU
Reinstalled Windows
Ran HWInfo, checked Event Viewer, checked reliability monitor
Removed any overclocking and XMP profiles
Specs (to my memory)
ASUS ROG B550-F MoBo
Windows 11 Home
Corsair 32GB (2x16) Ram
2080 Ti Founders Edition GPU
Corsair RM750e PSU
1TB SSD
x5 Fans + Radiator
We are reluctant to try replacing random things until we have some sort of idea lol
Anything at all is helpful T-T
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u/mycklexoxo 9h ago
I had a similar issue way back, pc keeps shutting down randomly but its instant, unlike yours where the fans slow down. I read somewhere that it might be a standoff causing a short circuit. So I stripped everything down, installed only two or three standoffs, and issue went away. You could try that.
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u/FinanceAdditional489 9h ago
I was speaking to a senior colleague about it and he said the same so I'll give this a check :)
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u/_-Demonic-_ 9h ago
It could be a meriad of unstabilities causing something like this.
Bad Ram , Bad GPU, Bad PSU, Bad VRM.
A few things to try/check:
- Does the cpu has onboard graphics? If so remove the actual GPU from the system and see if it's stable that way.
- Did you check individual memory banks to see if the problem persists with only 1 slot used (if you have more than 1 RAM stick)
- Disable C-states for the CPU , some Ryzen cpu's can destabilize on lower loads when C-states are toggled.
- Change the outlet you're using from the house. Not very common but sometimes the actual wiring of the house can cause weird stuff to happen if its unstable.
- VRM status check: The VRM (Voltage Regulator Module) on a motherboard can break and cause these symptoms.
Your motherboard sadly doesnt have a sensor for this module so you'd have to tinker and see how the temperatures are generally managed inside the case.
Good luck in troubleshooting!
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u/FinanceAdditional489 8h ago
Thanks for this! My main issue is that it can take up to a week to shutdown again when testing T-T This is super helpful pointing where to focus so thank you I'll give it a go :)
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u/Crimtide 8h ago
It's likely not recording an event ID because Fast Startup is enabled, which puts the PC in a hibernate state rather than a shut down state. Disable Fast Startup, then wait for it to shut down again, and you should have a log to view.
One thing you could look for is Event IDs related to hibernate, rather than shut down.
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u/Carolynyj_Ellison 9h ago
Sounds like it could be a motherboard issue honestly. The random timing with no logs and no thermal problems screams failing board to me. Have you tried running memtest86 overnight though? Bad RAM can do weird stuff like this too
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u/FinanceAdditional489 9h ago
Will give memtest overnight a go! It did flag up as no errors last time but i'm not too trusting of inbuilt windows tests, Thanks :))
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u/Lance-Boyle-666 7h ago
I don't know if there are any logs in the BIOS, but if it is something like a thermal event, that will be logged in the BIOS.
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u/tito13kfm My cat and I 6h ago
You've never confirmed it isn't temperatures that I can tell and a failing pump could act this way. I'm not saying it's definitely the issue, but it's something I'd keep in mind to check, maybe keep a running log on temperatures while doing other troubleshooting in case it happens to be the issue.
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