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Why Does my machine keep rebooting when I tell it to shut down

I have a Dell Optiplex GX150 loaded with Windows 2000 Professional.  It has begun to restart whenever I tell it to shut down.  If I press the power button or click start, shutdown then it will still restart.  The only way to shut the machine down is to hold the power button down.  

The machine runs great and my virus protection tells me that I don't have any viruses, spyware and/or adware.  Any help is greatly appreciated.
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mkdonohue

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mkdonohue, tried your suggestion and its still doing the same thing.

rindi, downloaded the latest bios options and it still did the same thing.

Funny thing is  sometimes it does what it should, i.e shuts down when it is supposed to.
Ok, next step would be USB devices.

USB is notorious for causing random reboots and shutdown problems.

Somtimes it is really odd, as in a  device would cause the reboot problem if it were plugged directly into the motherboards USB port, but not if the device were plugged into a USB hub instead.

Pull all your USB devices and try that - if you are using a high end USB Keyboard or Mouse, replace them with someting simple for the time being.

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No USB devices are installed.
Hrm... Ok we're stating to get into the obscure stuff.

Here's a few more things:

Roxio Easy CD Creator - known bug - that wouldn't happen to be installed would it?

Check the "Wake On Lan" settings for both your network card AND BIOS.

Beyond that I'm kind of at a loss.
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Wake on LAN is set to off and there is no buring software in this machine.  I'm going to try to reload another drive insert it and see if that will fix it.
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Reloaded the OS and that fixed it.  Thanks to all for your efforts.
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I awarded points based on participation.  Thanks again.