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Unexpected shutdown
My desktop running Win 7 shut dopwn unexpectedly. It was not a power glitch. Is there somewhere in the system that might explain what happened? Thanks. |
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#2
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Unexpected shutdown
On 9/19/2015 8:38 PM, swalker wrote:
My desktop running Win 7 shut dopwn unexpectedly. It was not a power glitch. Is there somewhere in the system that might explain what happened? Thanks. How sure are you that it was not a power glitch? I had this problem a few years ago on a Windows XP PC. It turned out that the power supply would fail when it got too warm, which would happen because its fan died. -- David E. Ross Why do we tolerate political leaders who spend more time belittling hungry children than they do trying to fix the problem of hunger? http://mazon.org/ |
#3
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Unexpected shutdown
swalker wrote:
My desktop running Win 7 shut dopwn unexpectedly. It was not a power glitch. Is there somewhere in the system that might explain what happened? Thanks. There won't be any log event, if the CPU overheated. Modern CPUs (both AMD and Intel) have THERMTRIP. If the CPU gets that hot, the power goes off... instantly. If some malware has code to send the BIOS the shutdown command, the machine could be shut down that way too. The ATX power supply, at least ones that cost more than $20, have thermal protection. The ATX supply could shut off if it gets too hot. There would be no log generated for one of those either. To start the machine again in that case, the switch on the back of the computer must be toggled. ******* If you kill a "security" process in Windows, one of the processes considered "critical" to continued Windows operation, you're supposed to get a popup saying the computer will shut down in 60 seconds or less. Since that is a controlled shutdown, there should be more evidence later. Check Event Viewer. ******* I would carefully examine the physical health of the machine, making sure all cooling fans are running. Then, use a copy of SpeedFan to check the temperatures on things. http://www.almico.com/speedfan451.exe I think SpeedFan can read the GPU temperature now, so you probably don't need a copy of GPU-Z from techspot. If the GPU overheats on the video card, the machine won't shut down in that case. There is no hardware path for the video card to protect itself. If the video card fan stops spinning, the GPU can get so hot it melts the plastic body of the cooling fan (now stopped). And naturally, such a temperature is detrimental to the health of the silicon in the GPU (135C degrades long term life). Paul |
#4
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Unexpected shutdown
On Sat, 19 Sep 2015 21:19:16 -0700, "David E. Ross"
wrote: On 9/19/2015 8:38 PM, swalker wrote: My desktop running Win 7 shut dopwn unexpectedly. It was not a power glitch. Is there somewhere in the system that might explain what happened? Thanks. How sure are you that it was not a power glitch? I had this problem a few years ago on a Windows XP PC. It turned out that the power supply would fail when it got too warm, which would happen because its fan died. A friend had this problem and asked me to look at it. The machine was installed on the floor next to the stand. When I took off the cover, I saw just about everything was buried in an inch or more of dust and dirt. A thorough blowing out cured the problem. -dan z- -- Protect your civil rights! Let the politicians know how you feel. Join or donate to the NRA today! http://membership.nrahq.org/default....ignid=XR014887 Gun control is like trying to reduce drunk driving by making it tougher for sober people to own cars. |
#5
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Unexpected shutdown
"swalker" wrote in message
... My desktop running Win 7 shut dopwn unexpectedly. It was not a power glitch. Is there somewhere in the system that might explain what happened? Thanks. I think you are looking for a log file of some kind. Hopefully someone will be able to answer that. -- Buffalo |
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Unexpected shutdown
On Sat, 19 Sep 2015 22:38:27 -0500, swalker wrote:
My desktop running Win 7 shut dopwn unexpectedly. It was not a power glitch. Is there somewhere in the system that might explain what happened? Thanks. A few hours of study and reading and no certain answer. The power supply did not have to be manually reset so the problem didn't occur there. I suspect a temperature spike on the CPU cores as I had 3 instances of computation errors just prior to the crash. I was at the computer when the crash occurred and if a pop-up window warned of a high temperature I didn't notice it. There is an outside possibility that 1 of the 3 work units caused the crash but that is unlikely. 2 of the 3 work units have been successfully run and validated by different computers. The 3rd unit should be reported on soon. The GPU started back normally and managed to restart a work unit that had been running. This work unit managed to complete over the weekend and did so successfully. That was a welcome success. Paul, I am using ASUS Thermal Radar to monitor both the fans and the temperature points so I think I am covered. Sometimes you just don't know. Thanks for the replies. |
#7
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Unexpected shutdown
"swalker" wrote in message
... My desktop running Win 7 shut dopwn unexpectedly. It was not a power glitch. Is there somewhere in the system that might explain what happened? Thanks. I've used SpeedFan to monitor possible temperature problems. Worth a try. http://www.almico.com/speedfan.php |
#8
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Unexpected shutdown
On 09/21/2015 05:43 PM, swalker wrote:
On Sat, 19 Sep 2015 22:38:27 -0500, swalker wrote: My desktop running Win 7 shut dopwn unexpectedly. It was not a power glitch. Is there somewhere in the system that might explain what happened? Thanks. A few hours of study and reading and no certain answer. The power supply did not have to be manually reset so the problem didn't occur there. I suspect a temperature spike on the CPU cores as I had 3 instances of computation errors just prior to the crash. I was at the computer when the crash occurred and if a pop-up window warned of a high temperature I didn't notice it. There is an outside possibility that 1 of the 3 work units caused the crash but that is unlikely. 2 of the 3 work units have been successfully run and validated by different computers. The 3rd unit should be reported on soon. The GPU started back normally and managed to restart a work unit that had been running. This work unit managed to complete over the weekend and did so successfully. That was a welcome success. Paul, I am using ASUS Thermal Radar to monitor both the fans and the temperature points so I think I am covered. Sometimes you just don't know. Thanks for the replies. When I have problems I usually run a RAM test first. If all is OK... the hard drive diagnostic |
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