Question PSU shuts down with a click within half a second after turning on

pirx_the_pilot

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Dec 1, 2014
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Hello good people. I'd really appreciate your assistance with my issue.

The story: I built a new PC (all parts brand new), it was running fine for a few hours, and then shut down unexpectedly and wouldn't start any more. Upon pressing the power button it would either not react at all or turn on for half a second (the lights on the CPU aio would also turn on) and then shut down immediately with a click. After some troubleshooting steps I took out the PSU to test it separately (it came with a little psu tester for shortening the pins to spin up the fan). I tried plugging it alone into a socket, and also connected it to my old system. In both cases the result was the same - the PSU (its fan) turned on for half a second and right after that shut down with a click. The old system works fine with its old PSU plugged into the same socket.

Is it possible there is a short somewhere inside the PSU? How come it worked fine for several hours?
 

pirx_the_pilot

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Dec 1, 2014
24
1
4,515
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Please post full system spec with PSU make and model included.
Sure, here's the part list (https://pcpartpicker.com/list/6fmtGG):

Intel Core i9-9900K
Corsair H150i PRO
Asus ROG MAXIMUS XI HERO (WI-FI)
G.Skill Trident Z RGB 16 GB (2 x 8 GB) DDR4-3200
Samsung 970 Evo 500 GB
Samsung 860 Evo 1 TB
Asus GeForce GTX 1080 Ti 11 GB STRIX GAMING OC
Phanteks ENTHOO EVOLV X
SeaSonic PRIME Ultra Titanium 850 W
Windows 10 Home OEM 64-bit
Iiyama Prolite XB2783HSU-B1DP

The PSU is a Seasonic Prime Ultra Titanium 850w
 

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