Have an emachine that I need to make sure it is the power switch going. It has black and white to pins on the motherboard. Out of the machine parts I have I cannot find a switch that only has two pins. Is there a way to mimic however the switch works to see if the machine will turn on? I know power is good to the board with new power supply the green lights up and sometimes when I engage power cord the cpu fan spins slightly like its got a charge.