Weird PC shutdown

[habbakuk87]

My PC is exhibiting a strange problem, it reboots by itself.
The first time it happened when I was surfing and trying to open a pdf file,this happened after almost a whole day of encoding and encoding was happening when it happened.Now the temps as per everest for GPU was around 50C and for processors I think around 60C.I have done encoding for days without shutting down PC without any problem so I am not sure overheating is the problem.
Now today I was only surfing net and had media player classic running in the background and suddenly my PC shuts down and tries to reboot, but it was unsuccessful and the fans start over and over again but power down too, then at last PC was able to get to the boot screen but then it again rebooted after which I manually shut it down.What could be the problem? Any help is appreciated.

 

[In2Photos]

Try another PSU.

 

[Schmide]

Try one stick of ram then the other.

 

[habbakuk87]

the present psu is corsair vx 450 and anyway I tried Occt test for PSU and computer shutdown within 3 seconds of it beginning the actual test.I put in another cabinet fan and this time the thing runs for a couple of minutes before shutting down.Now I don't know whether the PSU is not getting adequate cooling or it has gone fubar.

I encrypted/decrypted and compressed/decompressed a couple of files and ran the benchmark in winrar with no problem.Though not conclusive I still think memory is not the problem but will try memtest when I get time.

 

[mpilchfamily]

If it where a PSU issue the system would flat out power off not shut down and restart. So there is some other hardware issue going on here. I suggest running Memtest to see if that helps.

Also try the system in safe mode. If all goes well therer then it may be a disply driver issue. I've had this happen before when the display drivers where curupted.

 

[Schmide]

Winrar uses almost no memory. The dictionary sizes are in the kilobyte range.

 

[pcgeek11]

Originally posted by: mpilchfamily
If it where a PSU issue the system would flat out power off not shut down and restart.

Not always. I have seen PCs go through the continuous reboot cycles for a defective PSU on more than one occasion.

I think it appears to be a heating problem. Try starting it with the side off and a small fan blowing into the case.

pcgeek

 

[habbakuk87]

I think I have figured out the problem.I connected the PSU directly to the power supply, instead of UPS as I usually do.The OCCT power supply test ran for full one hour without problem.It seems I need to to change the battery or something with the UPS.Anyway, thank you everybody for your help.

 

[pcgeek11]

Originally posted by: habbakuk87
I think I have figured out the problem.I connected the PSU directly to the power supply, instead of UPS as I usually do.

You connected the PSU ( Power SUpply ) directly to the power supply ???

Are you saying that it works when you bypass the UPS and plugged it straight to the wall outlet?

If so it would have been helpful to know that you were even using a UPS to begin with! :disgust:

pcgeek11

 

[masterbm]

Is the northbridge fan running you can check in the bios

 

[habbakuk87]

Originally posted by: pcgeek11

Originally posted by: habbakuk87
I think I have figured out the problem.I connected the PSU directly to the power supply, instead of UPS as I usually do.

You connected the PSU ( Power SUpply ) directly to the power supply ???

Are you saying that it works when you bypass the UPS and plugged it straight to the wall outlet?

If so it would have been helpful to know that you were even using a UPS to begin with! :disgust:

pcgeek11

I kind of assumed that everyone uses a UPS with their computers but seems I was wrong.

AFAIK Northbridge has a heatsink and only the processor has a fan which is running(easy to tell it makes a lot of noise).

 

[masterbm]

actual fans don't always make noise before they die when the northbridge fan died on one my machine it made no noise just stop working. But i am glad you have it running

 

[habbakuk87]

Well, it seems the diagnosis with UPS as the faulty device was wrong. Now I am not using any UPS but the PC still shut downs randomly it doesn't matter whether I am only surfing or encoding or any thing stressful.The problem has resurfaced and increased in frequency within past 3-4 days with PC sometimes refusing to POST for hours and just whirring up the fan.
Steps I took :
1) Ran OCCT PSU stress test custom test 1 hour. Result pass.
2) Ran (booted into) Memtest86 , it ran for 3 hours. No problem.
3) Intel Test Burn maximum stress 7 times. Result pass.
4) I ran chkdsk /x/f on all my harddrive partitions with no bad result.Also I know people say S.M.A.R.T is not reliable but FWIW it passes for both HDD's.
Is my motherboard failing(my onboard audio failed almost a year ago). Is there anything more I should test for.
Any help is appreciated.

 

[JackSpadesSI]

I'm not trying to hijack this thread, but I wanted to mention that I'm having what appears to be the SAME problem and it only started this past weekend (2 month old computer).

My specs are in my signature. I don't use a UPS, but I do use a power strip before the wall.

Would someone please link to the OCCT PSU stress test? I've never heard of that. Also, what is chkdsk /x/f? My Memtest86 worked fine, too, like habbakuk87.

I worry it may be overheating, but I'm nowhere near qualified to troubleshoot PCs. If I find it is heat I'll buy this:
http://www.newegg.com/Product/...x?Item=N82E16835233003

 

[habbakuk87]

http://www.ocbase.com/perestroika_en/index.php?Download

the chkdsk command in command prompt unmounts the drive and checks and corrects any problem in hdd like corrupt sector(type "help chkdsk" without quotes in command prompt for more info)

 

[JackSpadesSI]

Thanks for the PSU app. Does chkdsk format the drive/delete information in any way? what was the /x/f part about?