I have a orion hp485d power supply, and when I turn on the switch it doesn't spin the fan. I don't have a computer to test if it works. Does anyone know how to get power supplies to work even when the switch won't do it?

I know a lot of ps need a little short or something to get them going.

Yep, you need to connect the green wire of the motherboard sensor to ground (black). See the RepRap instructions:

[reprap.org]

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Reprapping blog and other rants: [renoirsrants.blogspot.com]
My Reprap: [sites.google.com]

Yeah, now I feel like a fool, but it's working.