@baua1024 said in Mainboard 6HC (with SBC) does not start with all Fans Connected.:
That's interesting! I didn't came across these yet.
Arctic PWM PST series - these are indeed 4-wire fans, but the intention is to chain them in a way that you can control all of them with a single PWM signal - ignoring the tacho signals. So, at the controller, you end up with 3 wires.