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How do I test this PSU?

I had got this PSU for free from PC world, the guy who gave this to me does not know if it works or not...

This is my first PSU, I never used one before...

So I am asking you how to test this PSU. I hear they have safety wires that must be connected to another wire or something - I don't know...

I hope you can help me... Thanks!

UPDATE
Yay! My PSU works :-)

Thank you all who helped me!

And even better, I do not need to use a power resistor to keep the PSU on!

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The resistor might be a good idea, i think i sorta messed up the circutry inside a 400w one by not having a load
Plasmana (author)  thermoelectric8 years ago
My 200 watts PSU does not need a power resistor, it works just fine.
I was saying it might be a good idea to always have a load there because i nearly burnt out my 400w psu by not having a load...
Plasmana (author)  thermoelectric8 years ago
Why did your PSU nearly malfunctioned when there is no load resistor?
I don't know, i think just because it was a higher wattage or well i don't know, most people say to have a power resistor to keep a load or....
Plasmana (author)  thermoelectric8 years ago
Yeah, it might be something to do with a higher wattage PSU...
NachoMahma8 years ago
. If it has a 20-pin connector, jumper the green wire to a black wire and it should power up. You may need to have a load on the PSU for it to stay on.
Plasmana (author)  NachoMahma8 years ago
Thanks, and what about the gray wire called (P.G. SIGNAL)?
From http://pinouts.ru/Power/atxpower_pinout.shtml :
8 - PWR_OK - Gray - Power Ok is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation (+5 VDC when power is Ok)
. Shouldn't be needed for the PSU to run. It's to tell the mobo that the PSU is operating properly. If you don't have 5V on that line, the PSU thinks something is wrong with itself.
Plasmana (author)  NachoMahma8 years ago
Wow, thank you for all of this helpful information, I am going to test my PSU tomorrow...
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