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.

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/

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

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.

"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

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.

"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

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