on twist the green. and tape the end so tht the green does not touch anything else. green no wired in at all. only have your pwer and ground tht is all you need
thier should be three wires comming out of your fan right? the red green and black. you only need to have the ground and positive wired up. the best way to find out which are the correct wires is touch the ends to a 9v batter. it will turn the fan on tht is how my pox is powered while i am building my own pc grow box.
ik. how old is the power supply?
it might just be a bad supply.