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Computer kept restarting and eventually would not turn on

by mauporte / November 5, 2013 12:30 AM PST

OS: Microsoft Windows 7
Graphics Card: Nvidia GeForce GTX 560 Ti
Processor: Intel Corte i7-2600K CPU @ 3.40GHz (8 CPUS)

So, I was playing skyrim and the computer restarted out of the blue (at first I though this was a power surge). I played again and about half an hour in, ir restarted again. I checked and the computer was a tad hot, so I decided to stop playing and even placed a fan directly at the case. I decided to stream a documentary and even set up a task for the computer to turn itself off after 2 hours. (I imagined I would fall asleep) After about 10 minutes, the computer restarted itself again. So I started trouble shooting. I closed nvidia panel, turned off the automatic restart function on my pc, opened the case and checked that every cable and card was well connected to the motherboard/power source. And about 5 restarts later (each one lasting in between 5 to 10 minutes) The computer just wouldn't start again. It shows no sign of power at all so I'm thinking it could be the power source, but It doesn't seem to explain all of the symptoms to me. Or could it be that on top of whatever's causing the computer to restart over and over again the power source also got damaged?

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All Answers

Best Answer chosen by mauporte

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If you have seen power issues in the past
by R. Proffitt Forum moderator / November 5, 2013 1:01 AM PST

You would see a cacophony of errors, symptoms and a collection of BSOD numbers. You didn't list your PSU make/model/details but I'd like to see 550 or higher Watts in a good size case with a +12V Single rail.

You can test power supplies using a Volt meter and the Green Wire test in a pinch or a PSU tester or the more common method of adding 100 or more Watts (and moving to single rail if this is not) to your NEW PSU.
Bob

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36x34x17
by mauporte / November 5, 2013 3:15 AM PST

The case measures 36x34x17cm
PSU: KEMEX, 450W

I've had it for about a year, and no problems thus far, I make lots of renders (no animation), and would think those need more resources from the computer than playing skyrim. I don't really know much about electricity so I plan on having it tested by someone else today, I'll report back what they discover. Thanks

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Link, comment.
by R. Proffitt Forum moderator / November 5, 2013 3:29 AM PST
In reply to: 36x34x17

http://mlm-s1-p.mlstatic.com/fuente-de-poder-kemex-450w-24pin-3457-MLM4260023260_052013-F.jpg seems to show a paltry 20 Amperes on the +12V leg.

http://www.anandtech.com/show/4135/nvidias-geforce-gtx-560-ti-upsetting-the-250-market/16 gives me about 160 Watts for the card peak and well, it's like driving your car at 120 MPH. It may be fine for awhile.

-> It's always interesting to see clients that talk about how it worked for a year or two but since power supplies do age and weaken over time, you have to let them think it through.

If you are like our shop, we charge by the hour and the clients seem to want to pay for us to consult longer rather than swap out a cheap PSU.
Bob

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PSU
by mauporte / November 5, 2013 5:25 AM PST
In reply to: Link, comment.

So I should definetly change to a 600W PSU? The thing is nothing smells burnt, but I do not know if PSU's burn out or just break down.

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As noted you can test such things.
by R. Proffitt Forum moderator / November 5, 2013 7:16 AM PST
In reply to: PSU

There is the Green Wire PSU Test (see google), PSU testers and more however those cost more than a PSU unless you run a shop and have clients that want more proof than popping in a new PSU.

In your case it's the most likely suspect but I get the feeling you would be upset if it wasn't so you may want to reconsider self repair since at the shop it takes about a minute to plug in a shop PSU for the quick test. That cost is minimal and we get a direction in under 5.
Bob

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Thanks
by mauporte / November 5, 2013 9:54 AM PST

Tests with new PSU worked excelent, and yeah the old was was dead. I'm glad to know the restarting problem wasn't a separate issue. I'd hate it if know I would need to start software troubleshooting now.

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Good to read.
by R. Proffitt Forum moderator / November 5, 2013 1:55 PM PST
In reply to: Thanks

Sorry about me not giving any warranty about the answer. It sounded like the usual but given what can happen when a PSU fails, you have to take it to the bench for the test.
Bob

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Thanks
by mauporte / November 5, 2013 10:00 AM PST

Tests proved great. Computer was left rendering while streaming with multiple office aplications running for about 3 hours and it didn't restart itself. I'm glad to know that they weren't separate issues. The PSU fan seems less stressed as well. I understand what I did wrong with your help.

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Answer
PS
by mauporte / November 5, 2013 12:31 AM PST

I did get a blue screen from death on the last restart, but it lasted to little and was unable to write down the error code (which I normally do)

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