I would like to get my Dell Poweredge SP590-2 motherboard working.

It is a never used spare part and doesn't have any power connectors fitted. I was wondered if anyone happens to know the pinout of connectors or at least which power points are needed. I suppose I can try to figure out the pinout with a multimeter and find out where the +12V, +5V, -12V and GND goes. However, not sure how to get it started. Power 4 and 5 looks like AT-style connector. Anyone knows how to get this bird to fly?