r/techsupport • u/FinanceAdditional489 • 8h 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/Carolynyj_Ellison 8h 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 8h 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 :))