Question about HP ATX-300-12Z (ATX30012ZBD) 300-Watt Power Supply
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.
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Posted on Feb 06, 2011
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Posted on Jan 02, 2017
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