Latitude 3520 fan wont spin after taking laptop apart

Question

I tore down my latitude 3520 so I could move the motherboard and internals to a new keyboard shell. The laptop turns on but the fan doesnt spin at all. Ive unplugged it, ran the dell system test, tried to hot swap it and nothing. I didnt drop the fan and I made sure to plug it into the correct spot. Did I do something wrong?

ejn63 · Answer

Does the fan spin up during the diagnostics (F12 at powerup)?  Most fans do not come on until a temperature setpoint is reached -- so the fan won't necessarily spin up when the system is powered on.