Weird PC rebooting problem

[FKS]

My 2nd PC based on the Intel 865 PERL and the P4 2.8GHz reboots when I click
on "Turn Off" in XP SP2.

I *disabled* "Automatically restart PC in critical errors."

Here's what's happening.

-The PC is *ultra reliable* when it's on. It reboots only when I turn it
off. That's the only problem. --> Thus, I doubt that my problem is
hardware-related, but who knows?
-The rebooting problem happens even in the safe mode.
-I examined log files but couldn't find info about some driver crashing
during the shutdown period.

I am at my wit's end. Well, I can reinstall XP to see if it can solve the
problem. But I need to have an idea about what could cause this strange
rebooting.

 

[Frank McCoy]

My 2nd PC based on the Intel 865 PERL and the P4 2.8GHz reboots when I click
on "Turn Off" in XP SP2.

I *disabled* "Automatically restart PC in critical errors."

Here's what's happening.

-The PC is *ultra reliable* when it's on. It reboots only when I turn it
off. That's the only problem. --> Thus, I doubt that my problem is
hardware-related, but who knows?
-The rebooting problem happens even in the safe mode.
-I examined log files but couldn't find info about some driver crashing
during the shutdown period.

I am at my wit's end. Well, I can reinstall XP to see if it can solve the
problem. But I need to have an idea about what could cause this strange
rebooting.

Um ... Look in your BIOS, not Windows.

 

[FKS]

Um ... Look in your BIOS, not Windows.

I also updated my BIOS.

 

[Brooks Moses]

I also updated my BIOS.

Specifically, look at the BIOS settings. There may be something in
there which is set to reboot the computer on power-off or something like
that.

- Brooks

 

[Frank McCoy]

I also updated my BIOS.

But LOOK in the BIOS for something like "Automatically boot on power-on"
or something like that; probably in the chipset "features".

 

[FKS]

Well, if I disable the onboard LAN (the MoBo is the Intel 865PERL), the PC
won't reboot. I re-checked the network setting and "Wake on LAN" is
disabled.

So, is it possible that the onboard LAN is going bad? I ran diagnostics in
XP for the LAN card, and everything came out just fine. I did look at the
BIOS setting and couldn't find anything that might trigger rebooting...