As of yesterday, my computer started turning itself off about 30s after I boot either Linux Mint or Windows 10 (both still in the loading mode, I never reach a usable OS).

I have removed the PCI card I had (only the GPU is installed at the moment), the second hard drive, the CD/DVD reader, it still crashes. I have even tried removing the main hard drive and booting from a bootable USB drive with Linux Mint on it, but the computer still turns itself off.

Memtest86+ can run for hours on end without the computer crashing and without detecting any errors. The CPU temperature stayed constant at about 70°C during this, so I don't think the crash comes from a CPU overheating problem.

I did not do any recent changes to the computer that would have created the issue.

I am a bit clueless as to what the problem could be and how I could fix it.

  • May be it is power supply unit? Can you test with another PSU? And how you measure CPU temperature while booting? Or it is only while memtest86 is working? – MiniMax Jun 2 '18 at 10:03
  • @MiniMax I don't have another working PSU available right now, I will try to get access to one to try. Yes, the temperature was measured during memtest86 – Benoît Vernier Jun 2 '18 at 11:12
  • Also, I just run memtest86+ on my old testing PC (AMD Athlon II X2 240) and CPU temperature is about 45 degrees C. And on another PC running Ubuntu 16.04 CPU's (i5 2500) temperature is about 40 degrees C. So, may be you have overheating? – MiniMax Jun 2 '18 at 11:17

It looks like a hardware issue. I think, try to remove all hdd, ssd, dvd etc. devices, and run a live linux from usb stick (as far as I understand you, when you tried live system, you left one of hdds connected) If it works... my first idea is a failing PSU. The second: defective mainboard.

  • I also tried booting from the live USB with all the HDDs disconnected and it still crashed. I don't have another working PSU at the moment but I will try to get access to one to test. – Benoît Vernier Jun 2 '18 at 11:13
  • I went to buy a new PSU today and now the computer works like a charm. Thank you! – Benoît Vernier Jun 3 '18 at 13:44

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