computer won't always start

[steveo2]

My computer will not always start up when i hit the power button. I checked the wires from the button to the motherboard and they look secure. The power supply is only one year old. The power supply does work because the computer will startup usually after I unplug it and flip the I/O switch on the power supply a couple times. Is the problem with the powersupply or the motherboard not reading the button press? Thanks.

 

[microAmp]

What kind of PS is it, what is your rig?