I just checked the old and new fans with a 9 volt battery and they all work.
I put the old fans back in the PS and they worked. The circuit boards on all
4 fans are encased in plastic so there in no way to get to them. I am
thinking the fans are proprietary to this PS. In order to replace the fans
the circuit boards have to be the same. The label on the PS says "with Fan
Sensor Control", whatever that means. The PS isnt an Antec or top of the
line but it does a great job. There is no way I can use the old fans, way
too noisy. There has to be a way to wire these new fans so they always stay
on when the computer is on