I think that I have a problem on this PSU in Compaq EVO W4000. I cannot discover how to power up the PSU when it is sitting on workbench. I would like to test the outputs of PSU but connecting the "PWR_ON" pin8 to ground will not take the PSU out of Standbye! I'm trying to find out why the CPU fan does not run!
Unless you have a proprietary PSU, you should be jumpering the green to any black to start the PSU. I believe the green is pin 17. A black should be right next to it.