Windows not powering down. =(

[enyceexdanny]

Hey guys,

I just recently upgraded my motherboard, ram, cpu and video card.
Did a fresh install of windows xp pro twice. And I'm still getting this problem.

When I power down via windows, it just stalls at "windows is shutting down"
The weird thing is, if I just power up and not run any games - it shuts down properly.

I've researched about this issue all over, and have done every possible instructions I can find to try to resolve this problem.

Can this be a psu issue? But before upgrading my parts, it has never done this.
My psu is antec truepower 550.

Thanks in advance.