I have a P8P67 EVO mother board with a I5-2500k CPU not overclocked, and a 1,000 watt power supply. Recently when I try to hit the power button my my tower the Computer will not turn on. If I turn off my power supply and wait for the lights to turn off on my motherboard then turn the Power supply back on and then hit the power button on my tower the computer turns on without a problem. I am personally thinking that the Motherboard might be having the problem. Any suggestions to what it might be? My system is about 2 years old.