Antec 430w power supply won't turn on

If when you try to turn on youre computer the coolers are spinning for a short while as the computer would start and than they turn off, than it has a problem with the AC/DC diode transformer. There ast=re 4 to 8 diodes in there in parralel with asa many capacitors witch are transforming alternative curent from the secundary winding in direct current. In this case replace the diodes with ones with the same technical specs. If the computer won't even try to start check for brohen resistors ( or safety fuses.. the same thing because any resistor is a safety fuse ) or broken capacitors ) they are broken if they are blackened. The resistors can be checked with an Ohmmeter ( if theyr impedance is null or infinite they are broken ) the capacitors can be checked in the same way with a multimeeter ( if theyr capacity is 0 microFarads they are broken, or you could check them by applying to every one of them a closed circuit with a low voltage light bulb as the ones in small flash lights and a AA or AAA battery... if the light bulb turns on then the capacitor is broken). if none of these are the problems than check the PowerGood Signal or PGS. It is carryed usualy on a grey or green wire from the power supply to the motherboard trought the ATX connector. You can find the color coding for the wires on the case of the power supply (RED-+5v YELLOW +12v Orange +3.3v etc.). If the PGS wire is severed the computer will fail to start. Replace the PGS wire to solve the problem. Eventually check for any loose wires in the power supply because they can lead to shorts or to non functionality. Be shure to check first the capacitors that modulate the direct courrent in the power supply. if those are broken the power supply will fail to function. The destruction of those capacitors can be caused by using innapropriate voltage instead of 220v 110v or the other way. This thing is controled by a switch on the back of the power supplu located usually under the power cord insertion slot.