Anyone know how to turn on an ATX power supply

Without a motherboard, and the switch plugged into it, how do you activate
an ATX power supply? There is no switch on the back of it like in the good
old AT-style power supply days.

There must be a couple wires that need to be set high (or low) or something.

According to this, it's the green wire. How do I set it "active low"?
http://www.hardwarebook.net/connector/power/atxpower.html

Thank you,

Matthew McDevitt

 

"Active low" means "Pull low to activate" (the power supply in this
situation.) So the PS will switch on when you connect the green wire to
ground.

Which does not mean it functions as you wish. A lot of power supplies need a
minimal load to perform well.

petrus bitbyter

 

If I'm not mistaken *active low* on the page you cited means you connect the
pin to ground to turn on the ATX power supply.

Also, I beleive they're *switching* power supplies, so you'll need a load.

HTH
Chris

 

Also, I beleive they're *switching* power supplies, so you'll need a load.

How many? lol

J

 

Here is what you need:
http://www.cyberguys.com/templates/searchdetail.asp?T1=113+0282

 

What would be the purpose of having the PS on without motherboard
other than to test it?

 

Perhaps because it is a damned cheap high current power supply?

BTW, top-posting sucks.

 

Just connect the pin 14 (Pson) to ground. (Ground is the
two blacks)
on the motherboard connector.
This will start the supply. Look on google for ATX
connector to find the
connector layout on hardwarebook.net.

KGF

 

As far as a load, how about a surpluss hard drive that many have laying
around. Puts a load on the 12 & 5 volt lines and allows you to check the
other voltages for nominal.