Server 2003 R2 - Unexpected Shutdown - No Dump File - No events

I have a server that is shutting down unexpected around 12:30PM each of the last three days.  Hasn't happened before.
Event log shows only
7/22 - 6008: The previous system shutdown at 12:39:41 PM on 7/22/2015 was unexpected.
7/21 - 6008: The previous system shutdown at 12:54:58 PM on 7/21/2015 was unexpected.
7/20 - 6008: The previous system shutdown at 12:20:15 PM on 7/20/2015 was unexpected.
No similar errors prior.

UPS Software shows no power failures from battery backup.

No BSOD dump file.

Ideas?

muG
LVL 6
Kris MontgomeryAsked:
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Dan CraciunIT ConsultantCommented:
Can you connect to ILO or similar and check the logs?

No dump file points to a physical error.
Maybe you have a job that runs at midnight that overtaxes the processor and the power supply is failing. Pure speculation, of course.

HTH,
Dan
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Kris MontgomeryAuthor Commented:
No iLo.
My thoughts were the same... possible hardware issue (PSU), but no tasks are running/scheduled for that time.
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Dan CraciunIT ConsultantCommented:
What is the manufacturer and the model of the server?
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Kris MontgomeryAuthor Commented:
Dell PowerEdge SC440
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Dan CraciunIT ConsultantCommented:
Entry level, so no monitoring interface...

On the other hand, the server is over 7 years old.

Maybe dried out capacitors on the mobo?
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noxchoGlobal Support CoordinatorCommented:
Interesting that it is shutting down almost at the same time. Is this server in a server room?
In other words there is no chance that some cleaning service person turns it off to use the power connection, right? Sorry, I have seen this already and would not believe if I did not see this myself :)
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Kris MontgomeryAuthor Commented:
The server hasn't done it since those three days.  I am unsure what the issue was.
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Windows Server 2003

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