mgm1214 0 Newbie Poster

I have a compaq atx pc with a 24 pinout connector. I am trying to power it up external from the pc. I have tied the PS_on line to ground and have tied the 3.3V line to the 3.3 sense line. The PS does not activate, no fan or anything. Does anyone have any suggestions to what I am missing.
Thanks, Michael

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