I've been attempting to get this 4-pin brushless dc pc fan working for some time now. It has a red (+) black (-) blue (PWM in) and yellow (tachometer out).
I only want this fan running at maximum speed and I have seen people run these, like in this video without the PWM blue wire. However, they are still using the tachometer output, which I think it unrelated... I still cannot get it working.
I think I've tried any combination of wires connected to either + or ground.