Testing Power Supply Unit

Could someone please indicate which pins on the DC Power Connector Pin Assignments
for a Dimension 8100

http://docs.us.dell.com/support/edocs/systems/dsleest/techovu.htm#jumper

that I could use the famous paper clip to check if the unit is running.

I have read here on the forum that the check involves the green and black wires but they don't exist on a Dimension 8100.

 

Thanks for the input.