How do I manually turn on a computer powersupply??

I want to turn my old 480 watt computer power supply into a bench power supply, but I have no idea how to turn the thing on without connecting to the computer. The power supply is a 480 watt Reactor. I heard there is a standby 5v, and will turn on full power when you give it some logic input. Please post. Thx

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Gernerakos6 years ago
Find the Bigest connector (it was the connector of the motherboard)
And use an wire to connect the green and the black wire's socket. Its dosen't matter witch black wire's socket conected to the green one.
Thanks for the info!
mikesty11 years ago
Use a paperclip to short the green wire to a black ground.
heimo mikesty9 years ago
thanks i have tried it it works
LasVegas11 years ago
Computer power supplies are of the "Switching" variety. It's very important that a load be across the +5 line before turning it on. This will allow the supply to regulate all the other lines. I've always used an old hard drive to supply the load. Yes, just attaching a momentary contact switch between the green wire to ground will power it up and down. Some require holding the power button for 4 seconds to power down. Now, if it's an old Mac power supply, the green wire needs to be connected through a transistor switch to the trickle line (pink?).
theRIAA11 years ago
i have one thats purple to black... usually the only single color
chr11 years ago
Some computer PSUs require a little current to get started. If it doesn't start up when you short black and green, or the fan just wiggles back and forth.. try connecting a harddrive to it and try again.