How do you test a power supply w/o a motherboard

[web1723]

I just received a 300w HighPower PS for a new system, but I don't have a MB to put in my new case to see if it works.

Is there a way to verify that the PS is in working order now?

 

[ericd]

Plug it in and connect the green wire on the ATX plug to any of the black wires on the ATX plug.

Eric

 

[toph99]

and then once it's on, if you know how, you can take a volt meter and make sure that the right voltages are coming from the right pins etc.