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PC reboots for no reason


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#1 Aurelis

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Posted 27 September 2015 - 01:41 AM

I've recently encountered a weird issue where my PC would reboot for no reason and without producing any minidumps. Basically it can happen at any time even while my PC is idle. When it happens the PC abruptly shuts down and then tries to boot several times (it switches on and off by itself before even getting to POST) before actually doing it.

 

The first thing i did was check my memory with memtest86+ 5.01 and it shutdown at least 3 times while i was running it. It crashed twice while i checked all 4 planks without completing a single pass, and once while i was checking 3 planks of memory after it completed at least 3 passes. I thought that i found my culprit but unfortunately after i put the planks back in and checked them again... nothing happened. It passed both with 1 plank, 3 planks and 4 planks without any issues.

 

My system specs are:

 

Intel Core i7-6700K, 4200 MHz (42 x 100)
Asus Maximus VIII Hero
Corsair CMK32GX4M4A2400C14    32697 MB  (DDR4-2133 DDR4 SDRAM) which im running at xmp1 profile and i had set it to xmp2 previously. The pc rebooted both on xmp1 and xmp2.

Thermaltake 850DPS G PCU

 

I was wondering what else could be the culprit? Im assuming it can only be a hardware issue since it rebooted during memtest.

 

Im also using quite old APC UPS but im only using surge protection sockets. Could that be a reason why the pc reboots? It doesn't really make any noises and continues working normally when the pc reboots though.


Edited by Aurelis, 27 September 2015 - 01:47 AM.


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#2 sparklestar

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Posted 27 September 2015 - 04:11 AM

It could be overheating?

 

I doubt the surge protector is the problem, but it's not impossible.

 

Are there any popped capacitors in the computer?

 

Is everything plugged in and seated properly?



#3 ranchhand_

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Posted 27 September 2015 - 08:01 AM

 

after i put the planks back in and checked them again... nothing happened. It passed both with 1 plank, 3 planks and 4 planks without any issues.

Are you saying that now, since re-seating the memory sticks it has stopped crashing and now runs normally?

 

Next: try booting into Safe Mode and running the unit normally for a length of time. Do the reboots stop?


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#4 Aurelis

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Posted 28 September 2015 - 02:12 AM

It could be overheating?

 

I doubt the surge protector is the problem, but it's not impossible.

 

Are there any popped capacitors in the computer?

 

Is everything plugged in and seated properly?

 

I've got AIDA64 running at all times and so far had not notice any overheating. Im not sure what "popped capacitors" supposed to look like :/

 

I've rechecked everything when i was removing and putting the memory back in. It all seemed fine.

 

Are you saying that now, since re-seating the memory sticks it has stopped crashing and now runs normally?

 

Next: try booting into Safe Mode and running the unit normally for a length of time. Do the reboots stop?

 

Well yesterday it was switched on the whole day and nothing happened. But then again it appears to happen completely at random. First time it happened was a week ago, then i had a whole week without any issues, then it happened 4 or 5 times in the same day, including the times i've checked the RAM.


Edited by Aurelis, 28 September 2015 - 02:14 AM.


#5 ranchhand_

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Posted 29 September 2015 - 07:51 AM

At this point run it and see if it crashes again; then, if it does, immediately, try to boot into safe mode and see if it crashes there. That can tell us a lot.


Edited by ranchhand_, 29 September 2015 - 07:52 AM.

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#6 Aurelis

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Posted 30 September 2015 - 04:52 AM

Yeah i was going to do just that. So far i hadn't had any reboots.



#7 Aurelis

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Posted 01 October 2015 - 04:36 AM

So the reboot just happened again. I didn't boot into safemode though :/ What should i do now?

 

The reboots happened over and over again. I've tried switching ram sticks to no avail. I've switched to another PSU. Hopefully its some power issue rather than motherboard failing.


Edited by Aurelis, 01 October 2015 - 11:17 AM.


#8 ranchhand_

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Posted 02 October 2015 - 10:06 AM

Why didn't you boot into safe mode?


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#9 Aurelis

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Posted 02 October 2015 - 03:19 PM

Why didn't you boot into safe mode?

 

Simply forgot to do it :/

 

In any case - so far i didn't have any reboots with an older PSU. I think i might have fried the newer one by accidentally switching rounded pins into squared sockets in an 8pin slot on my motherboard. Though i've got conflicting opinions on whether its was ok to do it.



#10 gpruitt54

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Posted 04 October 2015 - 02:12 PM

While the PC is booting, go into the BIOS and monitor the CPU temp. Watch to see if the temp is not climbing while in BIOS.

While the PC is running, to install a CPU temp monitor to see of the CPU is not having temp spikes.

Are you connect to a UPS (Un-interruptible Power Supply)? If so, plug into a standard PC rated power surge strip and see what happens.



#11 Aurelis

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Posted 04 October 2015 - 06:29 PM

I've got AIDA64 for monitoring temps. They are all fine.

 

In any case - it doesn't matter anymore. The issue has not appeared since i switched to an older PSU. I guess the newer one was defective to begin with.


Edited by Aurelis, 04 October 2015 - 06:30 PM.





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