Have you tried to find a tech manual on that server? If you're lucky, it might have a wiring diagram with the info you need. Figuring out an unknown power supply can be time-consuming. You could try the following:
1. Figure out which pins are ground. They might be tied to the case or the mains ground wire.
2. Plug in the power supply
3. Check the small pins for one that's at 5V.
4. Make sure it's not a power pin by grounding it through a 10K resistor. If the voltage doesn't drop at all, it could be a power pin. Try 1K. If the voltage still doesn't drop, assume it's a power pin and move on.
5. During the above test, monitor one of the output voltages to see if the unit turns on. If the power supply has a built-in fan, you don't have to do this. The fan will start up when you turn the unit on. If it doesn't have a fan, you'll have to provide an external one!
6. If you find one or more pins that isn't a power pin but sits at 5V when unloaded, and the supply still hasn't turned on, cross your fingers and try grounding the pin through a 100 ohm resistor.
7. If none of the leads have 5V (or 12V) and you're sure you've got your ground connection right, you might have a dead power supply. That's a whole different problem!
The idea of the above tests is to hope that this power supply uses the same type of startup circuit as a standard power supply. That might not be true. Other than this, you'll have to trace everything out.
I don't think this test will damage anything, but no guarantees! You could end up with a big paperweight.
Ed
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