PS and CPU fan comes on merely by plugging in AC power

I am repairing a friends Athlon xp machine and have tested everything with extras.
I put a new MSI KM4M-V board in.  The pc runs xp fine, etc., etc., however, when shut down the pc, Windows shuts down, but the ps and cpu fan stays on.  Indefinitely.  I have to either flip the on/off switch on the back of the ps or pull the damn plug.
What gives?
When I plug the thing in cold, same thing; the fans come on and then I press the start button whenever I want and the system posts and boots normally.
A motherboard Short?  I checked the switch and even pulled the connector; the fans still come on when I plug it in.
Any thoughts?
Thanks.
J Romulus

Yes, I've let it run for hours after Windows shuts off, it simply doesn't go off.
Simply plugging it in or flipping ps switch, the same thing; ps and cpu fans come on automatically.
I've read all the APIC threads; if I were strictly having problems shutting down, maybe it be that.  But it is so strange that it does it from a cold start.
Got to be some kind of short, or else a bad board.

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