BleepingComputer.com: XP Pro won't shutdown using Shutdown command

I bought a refurbished (by Dell) DellGX520 Sunday.
When I turned on the desktop the first time it loaded, through Cross Platform Technology X3-Image, XP Professional Service Pack 2 and than I think it loaded Service Pack 3.

Once XP Pro installed I upgraded IE 6 to IE7.

Now I have an intermittent problem. When I click on the Shutdown command or the Restart command (using Start/Shutdown) nothing happens.

I can shutdown manually (holding the on/off button for however long until the desktop turns off). The system seems to operate normally for a while, i.e. turning off using the shutdown command, then it the shutdown or restart command don't execute.

No error messages or any other messages have popped up.

Please advise?
Thanks,
JP

Basic documentation on shutdown situations:

Troubleshoot XP Shutdown Problems (MS) - http://support.microsoft.com/?kbid=308029

Windows XP Shutdown Troubleshooter - http://aumha.org/win5/a/shtdwnxp.php

Troubleshooting Windows XP Shutdown Issues - http://www.theeldergeek.com/shutdown_issues_in_xp.htm

Troubleshooting XP Startup Problems - http://www.windowsnetworking.com/articles_...p-Problems.html

Louis

Thanks Louis, I search through the links Saturday and respond. JP