how to turn on powersupply W/O motherboard...

[max105]

does anybody know how i can turn on a power supply without a motherboard connected to it?

If not, can i somehow make a switch or buy one so that I can plug it into the ATX connector to "trick" it that a motherboard is connected?

 

[RC5Bri]

This is funny, just the other day I was worrying about this same issue only with an embedded computer, pc/104.

First, go here:
http://www.formfactors.org/formfactors/atx_ps.htm
and download the pdf. On page 18, it will talk about a signal PS_ON#. This is an active low signal(meaning you have to ground it to turn the PS on). Then on page 27 it will show the schematic of the ATX molex connector. All you need to do is short/connect the PS_ON# pin to COM(ground).

I did this on Friday, and it works perfectly. Good luck

 

[max105]

cool...i was afraid nobody would know how to do this!

just one question tho..which COM pin should i short the ps_on# with? will any COM work?

 

[RC5Bri]

Any of the COM pins will work, they are all ground. I just used the one next to the PS_ON#.

 

[max105]

cool..thanks alot!!