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I had power ran out on me on Sunday while the PC was on and since the the OS (Windows 10) kept losing power as soon as I put stress on it. Not shutting down, losing power and then rebooting. I looked up online and people say it was most likely an overheating issue. I check every sensor, logged in every temp, nothing out of the ordinary. Tried it today again, put some stress on the system now I can't really get it too boot Windows properly, it looses power before even I can log in.

When I enter the bios (MB Asus Prime z790-A) every temp seems okay but... The 12V rail on the PSU is waaaay above 12V (PSU Values). Now is this the issue that's causing the system to lose power? Is it as easy as replace the PSU (Corsair RB 850w)?

The entire hardware is a month old, can realistically a blackout cause a brand new PSU to go bad as quickly as that? I had a generic 650w that's still kicking after 5 years and a Corsair goes out like this? Is this my issue or am I missing something?

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    Electronic equipment can fail quickly or last a good long time. No telling what might happen. Return under warranty.
    – anon
    Commented Apr 11, 2023 at 20:05
  • I wonder if you had a power surge and not just a power cut. Consider getting a surge protector if you don’t have one already
    – James P
    Commented Apr 11, 2023 at 20:18
  • @JamesP funny thing is, I do have one. It would make much more sense to be a surge rather than a cut but alas probably the suge protector is faulty as well... Seems like I also should invest in the UPS I've been postponing since forever.
    – Naiade
    Commented Apr 11, 2023 at 21:06

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The 12V rail on the PSU is waaaay above 12v

Your photo shows 13.6v, which is not good... the tolerance specified by the ATX specification is ±5% for each rail... i.e: 11.4v (min) to 12.6v (max). What you're seeing is over +13%, which is very far out of spec.

This poor regulation could very likely be due to the power supply failing, and could also cause damage over the longer term.

The entire hardware is a month old

I'd suggest you turn the PC off, remove the power supply and RMA it. If you can possibly help it, do not use the PC in its current state at all.

can realistically a blackout cause a brand new PSU to go bad as quickly as that?

It may or may not be related... either way, avoid using that power supply wherever possible.

The "Bathtub curve" is an interesting phenomenon, and is worth familiarising yourself with.

bathtub curve, showing early failures, and wear out failures, with a low point in the middle

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  • Wow thank you so much for such an insightful comment. I'm not very well versed in the power aspect of computing and as such I had no idea the number was such a big deal. Honestly, thank you! PSU is already packed back in it's original case and I've already started the warranty process. It's sucks to be without a PC for an undefined period of time but at least all the other components were not affected by it.
    – Naiade
    Commented Apr 11, 2023 at 21:09

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