Windows 7 PC turns itself off to protect the system

A windows 7 PC will occasionally switch itself off after briefly displaying a message saying that it has to do this to protect the machine.

Is there any log I can inspect to find out more details about these events?  If so, I'd appreciate fairly detailed instructions on how to find the log.
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sjgreyAsked:
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aadihCommented:
You could look into the Event Manager.
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ded9Commented:
If this is a BSOD then check


C:\Windows\minidump

Upload the last three minidump for analysis



Ded9
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Frosty555Commented:
I find Nirsoft Bluescreenview provides more relevant information:

http://www.nirsoft.net/utils/blue_screen_view.html
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rindiCommented:
As has been mentioned, uploading a zip file with the 3 minidumps can help us find the cause.

Very often the cause of this is the system overheating, so I suggest you clean out all the dust, make sure the fans all run smoothly. Also remove the heatsink from the CPU, clean both surfaces very thoroughly, then apply a very small drop of fresh thermal transfer paste to the top of the CPU, and firmly and properly reattach the heatsink.
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sjgreyAuthor Commented:
Just awoken in this time zone and will get the minidumps and upload shortly thanks
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sjgreyAuthor Commented:
Last three dumps zipped and attached - thanks for any insight you can glean from them
Crash-dumps.zip
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web_trackerComputer Service TechnicianCommented:
If the computer keeps rebooting after going to the bsod before you can read the error. Do the following when in windows right click on Computer, select properties, select the advanced, click on the settings button under "startup and recovery",   remove the check mark from "automatically restart" (in the System failure section), then click the okay buttons. Now when the system crashes to a the blue screen of death you can see what is causing the system to crash. You can look on line how to resolve this type of crash. See Frosty comment above to interpret the bsod error and how to resolve it.
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sjgreyAuthor Commented:
It's not BSOD, just a black screen and then the machine closes and has to be manually restarted

I have cleaned out all the dust, even taking the graphics card apart to clean its fan and fins and reseat the heat sink with thermal conducting paste.  I haven't dismantled the main processor heat sink though, just blown and vacuumed the dust away.
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sjgreyAuthor Commented:
Update on symptoms, having checked with the user.  One of three things will happen:
 - Turns off and has to be manually restarted
 - Turns off and restarts itself
 - Goes to a black screen and will not respond to keyboard or mouse so it has to be turned off and back on again manually using the power switch (most frequent)
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ded9Commented:
Crash dmp points to rdbss.sys

Problem seems to be caused if the system is connected to a domain and trying to access files from network share or client file system corruption.

Can try chkdsk on boot .

Follow this article

http://support.microsoft.com/kb/2775511





Ded9
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sjgreyAuthor Commented:
I'll close this now thanks and start a new one if the advice offered by ded9 raises further questions
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