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Computer constantly rebooting

I got a client that has a  windows xp desktop that's consistently rebooting on its own since several days ago. It shuts down and turns back on by itself. It has Norton antivirus up to date on it. So I don't think it's a virus. What could be the problem do you think?

Thanks.
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now2010
Asked:
now2010
1 Solution
 
askurat1Commented:
Well a couple of things but just because it has virus software doesn't mean it couldn't have spyware or malware. Have you tried booting into safemode?
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cerrmjCommented:
Do you know if XP SP3 was recently installed (like when this happened) and the system has an AMD processor?  If so, take a look at this:
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?cc=us&lc=en&dlc=en&softwareitem=pv-60484-2
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jonahzonaCommented:
If it just reboots, it might be getting a blue screen but you don't know it because it is set to automatically restart on a system failure.

while it is booting, hit F8 for the windows boot menu.  Select disable automatic restart on system failure. See if a blue screen comes up when it fails.
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Sudeep SharmaTechnical DesignerCommented:
Check the Userinit.exe in Registry hive using the BartPE Boot CD, link below
HKEY_USERS \ MyXPHive \ Microsoft \ Windows NT \ CurrentVersion \ Winlogon

How to edit the registry offline using BartPE boot CD ?
http://windowsxp.mvps.org/peboot.htm

I hope that would help

Sudeep
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now2010Author Commented:
I disabled reboot on system startup and the problem went away. thanks.
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