pc restarting

Im running windows xp home. Every time i shut down the computer about a minute later it starts up again on its own. There are no error messages it just starts normaly by itself.its only been doing it since i got an o2 wireless box. But saying that i"ve tried removing all the leads from the box and shutting down but it does'nt work. I've even refomatted the pc and reloaded windows again. I've also tried wake on lan in bios and thats disabled. Its driving me bonkers as i have to switch off at the back. Somebody out there must have the answer, cheers,
 
That's odd. Possibly faulty wires (touching, frayed, loose?) on the Power button or near the MoBo leads? That or a skitzy PSU would be my first two guesses. Do you have a spare PSU or one you can borrow to do a bit of trouble shooting?
 
What was said above. Plus there is more than wake on Lan in the bios on most boards. Make sure that wake on USB/Keyboard/Mouse or any others you can find are set to off or disabled.
 
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