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Thomas NFlag for United States of America

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System keeps shutting down

I have a Windows 7 ultimate machine and it keeps shutting down on its own. I dont see anything in event viewer except:

Event ID 41: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.

Event ID 6008:The previous system shutdown at 1:49:18 PM on ‎12/‎9/‎2015 was unexpected.

Can someone assist on what could be causing this or how to start troubleshooting it?
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Could be just about anything.

Motherboard failing, power supply failing, overheating (possible also).

You could start by opening up case and inspecting motherboard for swollen or discolored capacitors.  If you find those you've probably found your culprit.  While open check for dust and blow and vacuum any out of the system.  Also check power supply inlets and outlets for dust.  Also while open get a big fan to blow into it and try restarting and running it like that.  That'll give extra cooling to the system.
It can be BSODing and quickly so that you dont see this blue screen of death.
Go to system advanced properties and enable there creating crash dump files.
How old is the system? Check whether There is an issue with the power supply's 3.3 volt source
During boot up get into the bios look at the system monitor options
What you are looking at is the voltage stats 12, 5, 3.3

The issue is that you say the system is shutting down.
Often the system will trigger a reboot..
and look in windows\minidumps for any dmp files - post the latest one here

also - install speedfan for monitoring the temperatures :

you can go 2 ways for troubleshooting, soft and hard
hard : replace parts, like powersupply, ram..
soft : disable programs in msconfig

run msconfig, select startup tab, and click disable all - reboot to test
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It was overheating. I need to some more fans.