Does a PSU still deliver some Voltage to the motherboard, even when the pc is turned off?

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McmElis

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Feb 16, 2017
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Hi! So I didn't really know here to put this thread, but I hope it works at this category.

Long version;
I am currently having a discussion with a friend of mine, he told me that the wanted to power something with a 230V to 12V transformer, I told him to use a spare PSU, because they're 12v transformers.
Then he told me he didnt wanted to jumpstart the psu all the time, and this is where I got confused, he doesnt have to jumpstart the psu all the time, because for as long as the power connector is in and the button is on, the psu will always try to deliver voltage to whatever it's connected to.
The reason I belive this, is when I turn off my computer, the led lights in the mobo is still on.
Then he just told me that my psu or mobo issn't working correctly.
Can anyone tell me how the power-on switch works with the connectors on the mobo and how this makes everything else power on, and can anyone tell me if it's me or my friend that is right?

Short Version;
So, does anyone of you know, if a PSU is trying to deliver voltage to to whatever its connected to (that needs 12v) or if it really needs to be jump started to power the rest of the components?

Thank you in advance, Elias :)

(and sorry for the bad english)
 
Solution
M
When the computer is off the only wire with power is the green one. It's the wire that feeds power to the motherboard for the switch on the case that is used to turn your computer on. It's also the one you use to jumpstart your motherboard when testing your motherboard before mounting in the case.
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mrb 59

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When the computer is off the only wire with power is the green one. It's the wire that feeds power to the motherboard for the switch on the case that is used to turn your computer on. It's also the one you use to jumpstart your motherboard when testing your motherboard before mounting in the case.
 
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VincentP

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Oct 18, 2013
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A transformer is AC to AC. A computer power supply outputs DC. If your friend wants AC then they need a transformer, if DC then something like a switch mode power supply.

There is a permanently powered rail on the PSU, but not the main 12V rails. You could google for a guide on how to use a PC power supply without a motherboard, but it would be much easier to get a simple power supply designed for what you need.
 
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Vic 40

Vic 40

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Oct 22, 2013
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It needs to be "jumpstarted". One black and the green wire on the 24 pin cable need to be connected to make it work.There are already premade connectors for.Something like this,
http://www.ebay.com/itm/20-24-Pin-ATX-Power-Supply-PSU-Starter-kit-Crossfire-SLI-Dual-Dispay-Free-Ship-/251581480036?hash=item3a936cbc64:g:TNIAAMXQCZ1TcgY-

Best would be to use the molex connectors if possible (if this is going to work anyway look at the above answer).
 
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