[SOLVED] Computer turns off after few minutes of using it. Powers back on. PSU?

[Papinix]

These are the problems I have experienced:

• Computer turns off while trying to install Windows 10 for the first time.
• After many tries, I was able to install Windows but can´t use it as computer turns off before the login screen
• Was able to install Ubuntu Linux and can use it a few minutes before the same thing happens

My built has the following SPECS:

• Msi Mag Vampiric 010 (Case)
• Corsair TX 750W (CMPSU-750TX)
• Gigabyte Intel Z490 Aorus Elite AC
• Intel Core i7-10700K
• DDR4 16gb 3200mhz Dimm HyperX Fury Black x 2 (32 GB)
• SSD 500GB Kingston A2000, M.2 2280, NVMe PCIe
• WD Black WD1001FALS 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s
• BE QUIET! PURE LOOP 280MM - NA0000050186

Everything is new except the PSU which I bought 11 years ago and the WD Black drive.
The PSU works fine in my old computer.

The motherboard has 3 ATX power connectors (24 pin, 8 pin and 4 pin).
My power supply has only a 24 pin and 8 pin, so only those are connected.
I left the 4 pin alone. (see image)

I have done the following (with no success):

• I am able to enter the BIOS and edit settings.
• I have flashed the BIOS with different versions.
• I have tried different combinations of RAM sticks (I have 2)
  • A1 - 16GB (both of them separately)
  • A1 - 16GB / B1 - 16 GB
  • A2 - 16GB (both of them separately)
  • A2 - 16GB / B2 - 16 GB
• CPU Temperature has not gone over 50ºC
• Removed WD Black and tried installing OS on Kingston M.2
• Removed Kingston M.2 and tried installing OS WD Black

Questions:

• Is there a "y-cable" splitter from 8 pin to 8 pin and 4 pin or something like that?
• Could I use one of the PCIe or SATA power cables with some sort of adapter?
• Is it mandatory to connect the 4 pin cable? (I have read all sorts of opinions but they usually says it's ok not to unless you overclock the CPU.)
• I will try another PSU just in case.
• Is there another thing I should try?
• Any BIOS settings I should consider tweaking?
• Any bootable USB with diagnosis tools I could use?

Thanks for your help.

 

[Fix_that_Glitch]

Try using just one stick of ram when booting up the computer to see if it will go to windows spalsh sreen.

 

[Papinix]

Try using just one stick of ram when booting up the computer to see if it will go to windows splash screen.

Thanks, I did this in all combinations without success

• A1 - 16GB (both of them separately)
• A1 - 16GB / B1 - 16 GB
• A2 - 16GB (both of them separately)
• A2 - 16GB / B2 - 16 GB

I guess they RAM sticks are OK (or both faulty).
Is there a way to test them with a software I can boot from a USB stick?

 

[Papinix]

So I bought a Y cable that splits into two 8 pin connectors. I was able to plug one of them to the 4 pin connector and the other to the 8 pin connector. The computer still turns off. Maybe the amount of current through that cable is not enough or I just need to change the PSU.

 

[Papinix]

OK, so a friend lent me his PSU and I only connected the 8-pin and everything worked fine. I was told older Corsair PSU are notorious for having CapXon capacitors in them, which are known to fail. I wonder if this is fixable or is it better to just get a new one.

 

[refillable]

OK, so a friend lent me his PSU and I only connected the 8-pin and everything worked fine. I was told older Corsair PSU are notorious for having CapXon capacitors in them, which are known to fail. I wonder if this is fixable or is it better to just get a new one.

No, Corsair TXs has Japanese caps, not Crapxons. You just have an old PSU that is way beyond it's supposed service.