power supply issue no power out

[elie.helou]

power supply issue no power out from the power supply. i did a power supply on alone between green and blue wires, it is working . there is power but on yellow wire i have 11 volts instead of 12 volts..
when i plug the power supply to the cpu. no voltage is out from the power supply.

[DaveLembke]

Why not just replace the power supply? They are cheap usually and they do fail. 

Additionally making a power supply run with nothing loading it down is not a true test of health. Loading down a power supply with a power supply tester or in a healthy computer is the true test.

[patio]

People seem to think jumpering 2 pins on a PSU is a test...it proves nothing zero nada...

[BC_Programmer]

The green wire is the power switch sensor. it's connected to 5V via a pull-up resistor.

The idea is you jumper that green wire to a ground wire and it is basically like hitting the power switch.

Blue isn't Ground. it's -12V.