I installed a new Thermaltake 420w
My Problem is The PC will not shutdown now.
When I try to shutdown windows it will restart it self.
Press and hold the power button 5 seconds it will immediately
Restart also. The only way to turn it off is the switch on the
Power supply it self.
When I turn the power supply switch on the PC will immediately
Something I hooked up wrong or something wrong with the PS.
Well it looks too me that you have your power button and reset button leads hooked up wrong on the motherboard. They can be a little bit of a pain too get hooked up right sometimes, so you might double check that.