ATX power supply problem

I have a smaller atx power supply which I wish to use with a kit for an mp3 player (based on a circuit board, CDrom drive and harddisk). How do I get the power supply to start? I know that a pc's on/off switch is a push-to-make momentary switch, but don't seem to be able to get the power supply up and running.
Any help greatly appreciated.
joffteeAsked:
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rrhunt28Commented:
I would look into seeing if you can find diagrams for the atx power suppy.  Probably one of the leads off the motherboard plug has to have voltage to fire it up.  
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lidskyCommented:
Try
http://www.duxcw.com/faq/ps/ps1.htm

It seems to have the info you're looking for.
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publicCommented:
Turn on the main switch in the back, if it has one, and ground pin 14 on the atx connector.
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rrhunt28Commented:
With your tongue, HEHE just kidding.  I would go to Radio Shack and get a switch to turn it on and off by grounding like public said.
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joffteeAuthor Commented:
Many thanks
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