Computer "restarts" when I click "turn off".........why?

[reddhaus]

When I go to shut down my computer, I click start->turn off computer->turn off.

It goes through the normal shut down but as soon at the power goes off, it clicks, the power comes back up and the computer boots up again.

Can somebody tell me what is going on and what I need to do to correct this?

Thank You.

 

[O-P-M]

Sure you didn't mix up the PW and RESET things when you were hooking your case up to your mobo?

 

[Clockworks]

Check the power button as it could be jammed, had that happen to before and the computer wouldn't shut off.