My physical server running Windows 2008 standard cold reboots with no reason or bluescreen like clockwork every two hours. Can't find the reason.

My 2008 Windows server on a physical host force reboots like clockwork approx every 2 hours with no blue screen, just shutdown and reboots.  By default it keeps going back into "start windows normally" and always leaves a Event 6008 unexpected shutdown but no reason why.  
"The previous system shutdown at 3:09:37 AM on 7/12/2018 was unexpected."
"The previous system shutdown at 5:13:11 AM on 7/12/2018 was unexpected."
"The previous system shutdown at 7:16:45 AM on 7/12/2018 was unexpected."

I'm racking my head trying to find the root cause.  
-I rolled back windows updates in June.
-I ran the Dell hardware diagnosis
-I checked task schedulers to see if there was something there

How else should I approach this?
Joe GIT personalAsked:
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Lee W, MVPTechnology and Business Process AdvisorCommented:
How's your UPS?
Alex GreenProject Systems EngineerCommented:
above is a good shout, also have you checked the Dell server homepage to see if anything is untoward in there, also

Go to system properties

advanced system settings

start up and recovery

settings

In the Startup and Recovery window, uncheck the checkbox next to Automatically restart.

lastly, get bluescreenview, get it on the server and then check the memory dumps.
arnoldCommented:
What does the Dell openmanage report?

Does the log indicate power loss?
How many power supplies?
which OS is installed, SBS?
standalone or AD?
just for reseat memory and any cards.

if it is a hardware related loss of power, the logs should reflect power loss on PS1/PS2 unless both ....

if you have two, move one to another circuit breaker. outlet change that is on the same circuit will not resolve the issue is it is power related.

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Joe GIT personalAuthor Commented:
The server has dual power supplies to different UPS's so I don't think its a power issue.   Its a standalone application.    

I'm checking on the dell open server tool and start up recovery options
Lee W, MVPTechnology and Business Process AdvisorCommented:
If those are correct times when the shutdowns occur, have you stood in front during one of the predictable times (2 hours, 3 minutes, 34 seconds after the previous)?  Have you watched Task Manager?  Is it freezing or just flat out rebooting?
Joe GIT personalAuthor Commented:
It flat out reboots.  I didn't have task manager open but when watching it, the screen goes dark for a few seconds then right into the bios post screen.
arnoldCommented:
on the Dell there shoukd be sone info, in the HW log.

What type of memory s in your system. Memory that is not registered, crc a memory error will panic the system triggering a reboot,

Use memtest to test the memory and see whether the system reboots when it reaches a certain range corresponding to Emory usage before reboot,

I.e. When memory use reaches 57% of capacity, it hits an unstable memory modules.
Joe GIT personalAuthor Commented:
hey all - with all the testing and lack of logs, we are finding out it is a bad PCI card.  The card is part of the servers function and that particular card is EOL but we are going to find somewhere to replace it.  Since the card is EOL there is no updated driver or diagnosis tool.  It's the only thing we cannot fully check, plus there are some events happening with it's driver in between the reboots.  It's our best option.  Thanks all.  

What we've done;
Bypassed UPS
hardware scans
re-seated all components
released any static build up
removed unnecessary services and startups.  
Called MS who supported us as much as they could with Windows 2008 standard (32bit).
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