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PC randomly shuts down and goes into restart loop


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#1 Bassquake

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Posted 05 July 2018 - 02:01 PM

Here's what happens:

  • Recently started to randomly shut down and restart with no warning (no windows logs).
  • Upon reboot, a few seconds later before gets to bios, it would restart again.
  • Have to turn off at mains switch to shut it down as it just loops on restarting.
  • On bootup after forcing turn off at mains, it tends to work again until next time it happens, which can be 5 mins after boot or an hour. Had it on overnight running benchmarks fine once.
  • It rebooted once while I was in BIOS so it's not a windows issue.

I have done the following:

  • Ruled out ram and ram slots as swapped them around, or in one slot at a time.
  • Cleaned ram contacts with isoprophyl.
  • Plugged PC into a different wall socket.
  • Unplugged any external devices.
  • Tried using old drive with win7, same thing happens.
  • Vacuumed PSU for dust, no dust on mobo.
  • Fans are all working.
  • Did a bios reset.

Does anyone have any ideas? Any other things I can try to rule out?

 

Could it be faulty PSU or CPU? Mobo battery maybe?

 

Specs:

  • Gigabyte x58a-UDR3
  • 18GB 1600Hz Kingston Ram
  • GTX-480 1.5GB
  • m.2 PCI-E adapter with Samsing 960 m.2
  • i7 950

Had this PC since 2012 and its in the last couple of months started having this issue. It first started soon after I replaced my SSD with an m.2. But I've ruled that out as it does it with the old drive.

 

Any help appreciated thanks



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#2 The-Toolman

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Posted 05 July 2018 - 02:45 PM

I would start looking at for bloated / swollen capacitors on the motherboard and also if available trying a different power supply with a known good one.

 

https://www.badcaps.net/index.php

 

http://www.punj.co.uk/punjwebfiles/electronics/mbbadcap.html

 

 

Bloated swollen top bad capacitor.

badcap.jpg

 

Flat top good capacitor.

goodcap.jpg


Edited by The-Toolman, 05 July 2018 - 02:49 PM.

I'm grumpy because I can be not because I'm old.

 

The world is what you make of it, if it doesn't fit, you make alterations.

 

Under certain circumstances, profanity provides a relief denied even to prayer.  (Mark Twain)


#3 Bassquake

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Posted 05 July 2018 - 02:51 PM

Hi The-Toolman. I've already checked for bad caps. It doesn't have those kind of caps anyway, they're of the Japanese solid capacitors design. Worth a check anyway thanks.

 

https://www.gigabyte.com/Motherboard/GA-X58A-UD3R-rev-20#ov



#4 The-Toolman

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Posted 05 July 2018 - 08:53 PM

I would unplug all power supply cables to the motherboard and then plug them back in to make certain there isn't a flaky connection with one of the connectors.

 

I would suspect a failing power supply / failed power supply being it's 6 years old and you have to shut it down by a hard power off.

 

Best way to check the power supply is with a known working power supply if available.

 

If you are using a surge protector or battery backup I would check and make sure they are supplying the right output voltage although unlikely to be the cause but still a possibility.

 

There is also a chance it's a motherboard gone bad.


Edited by The-Toolman, 05 July 2018 - 09:06 PM.

I'm grumpy because I can be not because I'm old.

 

The world is what you make of it, if it doesn't fit, you make alterations.

 

Under certain circumstances, profanity provides a relief denied even to prayer.  (Mark Twain)





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