Question Desktop suddenly shuts down 1 second after boot

j.kalkant

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Jan 14, 2018
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Hi, my desktop suddenly stopped booting and I'd like to ask for help.

Problem:
(tldr; boot fails, fans spin for a second, then shuts down)
Once boot button is pressed the cpu and gpu cooling fans spin for a split second and then the pc shuts down. Immediately after shut down the power button becomes unresponsive; fans don't even spin. If I wait for 30+ minutes, I can replicate the 'split second boot'.
The build was running perfectly fine for the past 4 years with no hw or sw changes directly prior the failure.

Specs:
  • ASUS Z170-A
  • i5-6600k OC @4.5ghz at static voltage
  • Kraken x61 closed CPU watercooler
  • GTX 1070 MSi Armor 8GB
  • Corsair Vengeance LPX - 16 GB @2667Mhz
  • Samsung 850 EVO SSD - 250 GB
  • WD Blue WD10EZEX 3.5" 1TB
  • Windows 10
  • NZXT Source 340 - ATX
What I tried:
  • Changed the PSU to CORSAIR RM Series RM750
  • tried booting without ram, gpu and boot drive (ssd)
  • disconnected led lighting
  • took out MB battery
  • left disconnected from power and peripherals for hours
  • different power sockets
None of my efforts made any difference.

Question:

Could you, please, help me to locate the issue? How can I test what's wrong?

Thank you in advance, lovely folks!

Edit: typo
 
Last edited:
Oct 1, 2021
9
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Hey, i tried moving motherboard having another issue and ended up having yours. Problem disappeared after refixing motherboard.
Try to run mobo-psu-cpu outside of pc box. If it works, check on how you place it.
 

j.kalkant

Reputable
Jan 14, 2018
4
1
4,515
0
What was the previous PSU?
SeaSonic M12II EVO 620 Bronze. It ran (and still does) fine since June '16. One thing though - while replacing the PSU I noticed that it was upside down the whole 5 years lol.

Hey, i tried moving motherboard having another issue and ended up having yours. Problem disappeared after refixing motherboard.
Try to run mobo-psu-cpu outside of pc box. If it works, check on how you place it.
Thank you for the suggestion! I tried with no success,unfortunately.



In my amateur opinion, there are 3 components left that could've gone wrong: mobo, cpu and SSD.

I'm too proud to bring the desktop to a professional, too uneducated to find a solution myself, and too poor to yeet that pile of transistors to the bin.

Do you guys have any other ideas? I'd really appreciate them!
 

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