PC wont automatically reboot

[Guest ddms70]

It has happened to my 590sli and another Asus AM2 board. The problem is, I

don't know if it is an issue with XP, AM2, nVidia or me.

 

I just installed XP on another new build and I don't know what I am doing

wrong, but now it won't restart or power off. It will shut down, screen goes

black, but the pc lites, fans, etc. continue to run and I have to hit the

power switch manually. Because of this, xp wont restart either after any

updates or programs are installed, as I have to manually restart the pc. I

wasn't sure when the problem would occur, so this time I reinstalled xp/sp1,

rebooted properly, then the chipset drivers, and now it wont reboot by

itself. I've read other posts with the same problem, but haven't found any

answers.

 

This is the second build it has happened on and I'm looking for any kind of

answer. Knowing me it is a small problem, but I can't figure out why it is

happening.