Windows 7: Issue with new power supply

The power supply on my PC works, but the fan is making an intermittent "tic-tic-tic" noise, so I decided to replace it.

After installing the new power supply, I got nothing. No LEDs, no fan, no hum... nothing. So I pulled the new power supply out, manually jumped pin 14 to ground, and it fired right up. I checked the voltages on all of the pins and all are in spec.

While I was doing this, I reinstalled my old power supply and my PC worked fine, so I guess the socket and the on/off button were not damaged in the switch over.



So I reinstalled the NEW power supply again and I got... nothing. Again.

This has me stumped. The new power supply is fine when outside the machine, and the socket and on/off button in the machine seem to work fine as well. Any ideas?

What is the wattage and what brand is the new supply? Check the pins in the 24 pin connector, maybe one is not fully inserted so its not making contact with the motherboard connector(?)

Thanks for the reply fireberd. The old power supply came as a package with the case; its a Raidmax 500w. The new one is also a Raidmax, but with 730 watts.

I'll check the pins again and make sure they are seated. I figure this has to be related to the "power supply on" pin (#14) somehow... but I don't know for sure.

Pin 14 (or ground) is the likey culprit. If you jumper front the back (not the pin side) of the plug and it works, try jumpering the pin side of the plug and see if it works.

It was a bad cable/connector. It's a modular power supply, and when I tested it w/o the cables it worked fine. Once I plugged in all the cables and installed it, it wouldn't work. They sent me a couple of new cables and it is up and running. Thanks for the help fireberd.