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Computer shuts down at 3am, really frustrating

Running Windows 7 pro on a Dell 490 fully patched.
The computer shuts down at 3am.  I don't know why.

Here is what I have done so far:
- The computer has Macrium backup installed so I checked the options there, the shutdown option is NOT selected.
- Checked the Windows 7 Pro power options, Allow Hybrid sleep is set to off

- Checked Windows 7 Pro backup, there is no option there I can find to turn off the pc

-  As far as I know, there are no other programs installed which have to option to shut down the pc

- Checked the Windows update options, they are set to “download them but let me decide when to install”

I don't know what else to check.  How would you troubleshoot this ?
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Are you connected to a UPS?
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Hello padas:  We don't really know since no one is up all night to watch the pc.

Hello joewinograd: Excellent suggestion, totally forgot about this.

Hello dsnegi_25dec: I checked the Event viewer,   I cannot see any event suggesting an abnormal shutdown.

Hello joewinograd:   I will change the update settings per your suggestion.

Hello leew: no UPS is attached to the pc

Hello tqfdotus:  This is a single pc in a small office.  No other pc's in the office.  As far as I know, there have not been any power outages yet the pc shuts down every day.
 
Hello Spec01:  Yes, if nothing else can be found then I will use msconfig.  

I will be at the pc in about 8 to 10 days.  I will assign points then.  Thank you for your prompt replies.   I appreciate all the ideas.
Thank you for the feedback.

Basic troubleshooting steps may include moving the computer to a different location, as in a different building altogether, for one night to see if the symptom moves with it, or even replacing it with another one to see if it happens to the other one? Good luck.
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I have not had a chance to get to the affected pc yet.   Not sure when I can get to it  so I am assigning points now.   Thanks to all who posted.