Question about HP ATX-300-12Z (ATX30012ZBD) 300-Watt Power Supply

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The green light is blinking on the supply unit but it not coming on or booting up , i need to know if the supply unit is bad

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Close examination of your power supply may reveal if the psu is bad.

When the power supply is plug in ac socket the green indicator led inside the motherboard will lit steady green. See if by turning on the cpu you will see some sparks in the power supply connector attached to the motherboard. This is a clear indication of a bad or shorted psu.

You can also smell if there is a burning inside the psu.

See if the fan inside the psu is working if not then its a clear indication of a bad psu.

Using a multimeter if you have one measure the dc voltage coming from the supply connector. Insert the black probe to one of the black wires in the connector. And the red probe to the red wire in the connector. the reading should be +12VDC. Put the red probe to the red wire and it should read +5VDC. Any readings below this, means bad psu.

Measure also the output voltage when there is a load in the power supply. Connect a CD-ROM drive or hardisk and measure again the voltage. Dropping of voltage when put some loads is a clear indication of a bad power supply unit (psu).

I hope this will help you.
Thank you for using Fixya!

Posted on Feb 06, 2011

  • joecoolvette
    joecoolvette Feb 18, 2012

    1) ALL Black wires are Ground wires, coming from the Power Supply.

    2) RED wires are 5 Volts.
    3) YELLOW wires are 12 Volts.
    4) ORANGE wires are 3.3 Volts.

    The Red probe lead is the Positive lead. It touches the power wire.
    3.3 Volts, 5 Volts, or 12 Volts.

    The Black probe lead is the Negative lead. It touches a Ground wire.
    A - N - Y Black wire is a Ground wire.

    ALL are DC Voltage. Set the multimeter to DC Voltage.
    If just a symbol by the Function knob of the multimeter, the symbol is a dotted line over a solid line.

    If more than one scale is offered for DC Voltage, use the 0 - 50 Volt scale.

    What is bad are Electrolytic Capacitors. The weakest link in the Power Supply.
    The large one's where the AC power cord comes in, are Filters for the Input Stage.
    The smaller one's are also Filters, and they are in the Output Stage.

    Electrolytic Capacitors have an Electrolytic Paste inside. When the capacitor goes bad the paste develops a gas (Hydrogen Gas), and the gas expands inside the capacitor.

    Eventually the resulting pressure from the gas compromises seals of the capacitor, and allows Electrolytic Paste to slowly ooze out.

    So much paste loss, and the capacitor operates at a weakened state.
    Too much paste loss, and the capacitor fails.

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