Computer turns OFF randomly (no pattern)

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123jon4

Apr 4, 2018
7
0
10
Hello,
my PC is turning off totally randomly. Without a blackscreen nor other error signals.
It happend the first time nine months ago and I replaced my PSU then. It worked one month after that without a flaw. Then I was abroad half a year. Now I'm back at home and the problem is there again. The system is from 2012.

Symptoms:
- Computer turns off completly randomly
- Off means like turning the PSU off
- PSU was replaced, could not be the problem
- Sometimes it works the whole day without turning off and sometimes it turns off even before the BIOS screen appeard, totally random
- It makes no difference if I play 3D games or do video editing or just writing something in Word.
- Sometimes it restarts immediately after turning off and sometimes I can not turn it on after waiting some time
- Today the BIOS was corrupted after one turn off, but was automatically restored. It was the first time this happend.
- After one turn off today my Windows is also corrupted. It shows a bluescreen right at the beginning of the boot screen. But the bluescreen is just displayed a very short moment and turns off then so I can not see what the bluescreen has to say.

What I already tried:
- Stress test with HeavyLoad was passed without a problem
- Tried without graphics card and BluRay drive, no difference
- Updated the BIOS
- RAM passed memtest86 test
- CMOS battery has full voltage
- SMART values of the hard drive are alright

System:
- Motherboard: Gigabyte GA-H77M-D3H
- CPU: Intel i7-3770
- GPU: Nvidia GeForce 560
- RAM: DDR3 32GB
- HDD: 1TB 7200RPM
- PSU: 630W


Could it be the motherboard? I could not find any pattern so the problem is not reproducable.

Thanks in advance.
 
Solution
RememberThe5th
LC is kinda "Shitty" powersupply, that doesnt have standard for atx 2.4 just 2.0, build of that PSU is 10 years old i mean its not that worst but it can handle half of its load but its usually overspec.
Sorry that "SHOULD" be my first question in your post.
And sorry again if i wasted your time...
Im not sure about buying a new psu (to not waste your money) but CX500M (modular) should be cheap enough
https://pcpartpicker.com/product/TgW9TW/seasonic-power-supply-m12ii520bronze
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1

123jon4

Apr 4, 2018
7
0
10


I live in Germany but this has nothing to do with this problem I hope. ;)
The problem started without an occasion. Nothing was changed.
Or do you mean that the cable could have some damage (loose contact)?
 
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RememberThe5th

RememberThe5th

Illustrious
Jul 30, 2014
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First try another plug (because earth might not be good, but that is a really rare case).

Well if im asking a bit much, can you do breadboard? (removing motherboard and putting it together on table , woodden is better but not on CARPET! And testing out will it shut itself off).

Now if it turns off, there might be an issue with GPU for overheating, but from my experience it should only cut off signal.
Did you try using only onboard video if possible somehow?(you have to install onboard graphics driver)

Last but not a common one, when did you last time re pasted chipset (it should be a heatsink on motherboard with Gigabyte logo, just be carefull not applying too much thermal paste)?

If it shuts off does it says on startup like overcurrent protection or similar?
 
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1

123jon4

Apr 4, 2018
7
0
10


I tried everything. It is just so random. I unplugged everything (also the dedicated GPU) and it even turns off in BIOS. Sometimes after a few hours and sometimes right after turning it on. I think it must have something to do with the motherboard because no other reason seams logically to me.

Yesterday I renewed all thermal pastes (CPU, GPU, Chipset) and after that it worked for 12 hours. Then I turned it off on purpose. Today I turned it on and it turned itself off again after some minutes. And no it doesn't give any error message.

Do you think it is a good idea to buy a new motherboard? It wouldn't be really new because there are no new boards with matching CPU socket.

PS: The error message on Windows start was related to the BIOS crash and the resulting reset of the AHCI setting.
 
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1

123jon4

Apr 4, 2018
7
0
10


I ran a full test with memtest86 and it passed. When it turns off I have to clear the CMOS with the jumper or remove the battery before I can turn it on again because otherwise the fans just spin for a second before the system turns off again or it doesn't even react to the power button.
 
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1

123jon4

Apr 4, 2018
7
0
10


I've noticed that I didn't turn on the XMP setting for my RAM which I bought before the problems first appeared.
The timing was 9-9-9-9 and now it is 10-10-10-10 which is also printed on the label on the RAM sticks.
I will see and report if enabling the setting makes any difference.
 
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1

123jon4

Apr 4, 2018
7
0
10
The disabled XMP profile was not the solution.

And now things getting weirder and weirder. Today I got a new motherboard. I installed it, turned the PC on, which made the fans spin for a split second and after that it turned off again. So I cleared the CMOS, double checked the cables and even then it didn't work.

I then got the idea to try my old PSU which I replaced 9 months before because I thought it caused the PC to turn off. But like a miracle it works fine. With the old PSU the PC runs. Very weird and I hope the defective new PSU is not directly related to the other events because then it must be black magic. I bought a new PSU because I thought my old PSU was defective. Then it worked for several months just to scrap the new PSU totally. Very weird. But now it runs fine.
 
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1

123jon4

Apr 4, 2018
7
0
10


Old: LC Power LC600H-12 (6 years old)
New: Thermaltake Berlin 630W (9 months old)

When I now hear the old one it is a clear difference in sound. The old one had a less powerful sound, like telling me it would shutdown every next second. But it might be an emotional thing. ;)
 
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RememberThe5th

RememberThe5th

Illustrious
Jul 30, 2014
6,996
172
41,140
LC is kinda "Shitty" powersupply, that doesnt have standard for atx 2.4 just 2.0, build of that PSU is 10 years old i mean its not that worst but it can handle half of its load but its usually overspec.
Sorry that "SHOULD" be my first question in your post.
And sorry again if i wasted your time...
Im not sure about buying a new psu (to not waste your money) but CX500M (modular) should be cheap enough
https://pcpartpicker.com/product/TgW9TW/seasonic-power-supply-m12ii520bronze
 
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