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PSU doesn't turn on in bare pc

F

fatbaby

Banned
Is that normal?

I have too much time on my hands so i decided to see if the psu works in my chieftech sx10xx case.

Right now, the only thing in it is a 420 watt psu, no fans, mobo, drives...

I plugged the ac cord into my surge protector and attempted to boot up the psu by activating the black button in the back (right?) and it didn't start up.

Is that normal so a mobo is required for psu start? Or something wrong?
 
Being a computer repair technician, I see two problems:

1. you should really hook something up to the psu or you could destroy it.

2. It's an ATX power supply and it gets its power from the mother board which triggers two power wires in the motherboard connector to turn it on.
 


<< Being a computer repair technician, I see two problems:

1. you should really hook something up to the psu or you could destroy it.

2. It's an ATX power supply and it gets its power from the mother board which triggers two power wires in the motherboard connector to turn it on. >>



Its an ATX PSU

Nothing to be afraid of right?
 
NEVER run a power supply without a load. That is, you better hook something up to it. And something else, you need to have the mobo connected, and you need to short a couple of pins on the mobo (the power switch pins) in order to cut on the power supply.

With all that being said, I would have to give you a few words of advice.

PUT DOWN THE POWER SUPPLY. STEP AWAY FROM THE POWER SUPPLY.
 
You could simply short the green and the black after you plug a few fans in or something.. but I wouldn't recomend you do that, if you die I am not responsible.
 


<< I just wanted to see if it worked...which it didn't.

Nothing to be alarmed of right? >>

It works, you're just not doing it right. The switch on the back is just a kill switch, it will not turn it "on". As said, you could short the power on lead to ground on the mobo connector, but that's at your own risk.
 
Take a safety pin and use it to short the green (power good) and black (ground) wires on the ATX connector that you hook up to mobo. There's only one green wire and you can use it with any black one.
 
To test an AT power supply:
  • ...plug in one device only (be sure to disconnect the motherboard) like a hard drive and power on; try another drive by itself if the first does not turn on. Note that the power supply will not turn on if there is nothing plugged into it. To test an ATX power supply, use an insulated wire only to jump the "power on" wire and the +5 volt wire directly across from it (i.e., the green and the red wires 4 wires in from one side).
Wiring of the ATX power supply:
  • ...There are times when you may want to test an ATX power supply or use the voltage from one but don't really want to hook up a motherboard. There's only one green wire and there are plenty of ground wires so it's easy to do. To use a bent paper clip and insert one end in the green wire connector and bend it around and put it into a black wire connector.
Testing ATX Power Supplies:
  • To turn on an ATX power supply without having to plug it to a motherboard, just ground the PS-ON signal from the power supply, i.e. conect the PS-ON signal (pin 14) to ground (pins 3, 5, 7, 13, 15, 16 or 17). Usually the PS-ON is connected to a green wire, so you will have to conect the power suply's green wire to the black wire, through a small wire or an opened paper clip.
How to troubleshoot an ATX power supply:
  • ...If you want to test the power supply take the power connector that plugs into the motherboard and jumper, with either a paperclip or a pair of fine needle nose pliers, the green wire with one of the black wires...
 
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