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Automatically rebooting every hour

Posted on 2008-01-24
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Last Modified: 2013-11-10
Hi Experts,
Here is a strange one that has me scratching my head.

The problem has occurred on 2 identical PC clone systems (One with Windows Vista Business and the other Windows XP pro)

The hardware specs are - intel DG33FB Motherboard with Intel Core2 Duo E6750 processor, 2GB Kingston DDR2 667Mhz RAM, Samsung 320GB SATA HDD

Here is the scenario - The PC is working fine when suddenly; one of the PC fans inside the case audibly increases fan speed and a 4-5 seconds later the system resets. Once the system is back online the same thing is likely to occur EXACTLY one hour later. This may repeat for up to 10 more hours and then the system may be fine for a few weeks.

Notes - When the system reboots, nothing is even slightly hot. I have run the intel system monitoring software and all temperatures are in the green before the system resets. I have taken the case off the PC to allow greater airflow but this made no difference. There is nothing in the event log that indicates why the system has reset, only that classic line "The previous shutdown was unexpected".
This is in a corporate environment, the only application software loaded on the system is
Office 2000 SP2
Ouitlook 2003
Mcafee virusscan 8.5
Winzip 9.0
Abobe acrobat reader 7.0

Thanks for any direction.
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Question by:MickDoev
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Expert Comment

by:PCBONEZ
ID: 20740138
Turn off all the auto-updates you have.
Windows, Anti-virus, whatever..
It sound like one has gone goofy and it's crashing the system
To find out which turn them back on one at a time until the problem comes back.
.
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by:nobus
ID: 20741107
you can run from a live cd, and check if it happens then too :
ftp://ftp.uni-kl.de/pub/linux/knoppix/KNOPPIX_V5.1.0CD-2006-12-30-EN.iso      Knoppix      
www.nu2.nu/pebuilder/                                     BartPe
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Expert Comment

by:burrcm
ID: 20741563
Try the desktop utilities to observe whether the system feels it has an overheat problem - 12. Intel® Desktop Utilities from here - http://downloadcenter.intel.com/Filter_Results.aspx?strOSs=All&strTypes=All&ProductID=2781&OSFullName=&lang=eng . This type of event occurs regularly with HP desktops if the 20/24 pin main connector comes loose, as the system then tends to lose the CPU temp sensor. Not HP here, but appears similar.

Chris B
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by:carloselfaite
ID: 20876556
exactly one hour??
does this system have a scheduled task, try desabling
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MickDoev earned 0 total points
ID: 20899059
Applied a BIOS update and the problem hasn't re-occured . . . yet
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Expert Comment

by:ajs1979
ID: 20899129
Hi Guys...

My first time adding to anything on here so I apologize if I do anything that's not considered normal...

Just letting you know that I too flashed my BIOS and the problem has been resolved.  Appears to be an issue on Intel boards with G33 and P35 chipsets...  maybe even more.  Hope this helps.
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