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I'm trying to re-use an old power supply (an Antec sl400) without a motherboard, and it's not giving me much power.

I followed the directions here (http://www.overclock.net/t/15751/info-can-i-use-two-power-supplies-with-one-computer), and I'm able to get the PS to turn on a fan, but it's moving at about half speed. I've got a paperclip connecting the green and black wires.

I've tried connecting additional hard drives to see if additional load would help, but no dice. This power supply was powering an entire computer before I took it apart (including this fan).

Any ideas on how to get the full power out of this power supply?

Thanks!
-SC