[SOLVED] Desktop suddenly shuts down 1 second after boot

[j.kalkant]

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

 

[helper800]

Please go down this list of items meant specifically for diagnosing such issues.

 

[j.kalkant]

Please go down this list of items meant specifically for diagnosing such issues.

Thank you. I went through it when I built the system 4 years ago, and for good measure also now. Sadly, there's still no post (not surprising, as I did not touch the hardware at all. Something just broke and I don't know what)

 

[Ulrikat]

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.

 

[--SID--]

Changed the PSU to CORSAIR RM Series RM750

What was the previous PSU?

 

[j.kalkant]

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!

 

[--SID--]

SeaSonic M12II EVO 620 Bronze.

Did you replace all the modulair Seasonic cables for the new Corsair cables?
Or is there an old modulair Seasonic cable (PCI-e, molex or SATA) in use with the Corsair PSU?

 

[j.kalkant]

Did you replace all the modulair Seasonic cables for the new Corsair cables?
Or is there an old modulair Seasonic cable (PCI-e, molex or SATA) in use with the Corsair PSU?

A little late of a response, but you were nearly right here. The original PSU was faulty which I replaced. By mistake I used the same power cable, which proceeded to tear a brand new PSU and fry two internal and one external drive (yes to both; left it plugged in and I feel ashamed).

Drives, PSU and cables replaced and my old fella is running fine.

Thank you all for efforts and help.

edit: included gratitude message