eMachine won't turn on...What could be wrong?

I have an eMachine tower, brand new 2 years now. Never had a single problem with it until it shut itself down about a month ago and will not turn back on. When the power button is pressed, you can hear the fan in the power supply come on, but there is no power lights on the tower or any response from anything. I originally thought it to be the power supply since it had a fusible link that can go bad and will only run certain amount of power output after it blows. Bought a new power supply with the exact same response. Anybody have any ideas?