I must see if I can take pics, Ive done so many I can do them with my eyes closed.
On the black casing that holds the motor in place is a small micro switch , Often these machines are worked on by inexperienced and they do not make sure that actuator is not in the correct possition and you end up with a situation like your finding. Simply clip in the catuator the correct way and you should be all good..
Just a by the way , never rigg the cleaner heads on these newer dysons to the mains like you could do on older dc 18's 24's and 25's . These heads use a 220v DC motor and the rectifier pcb board sits in the main vacuum body ( older cleaner heads had the pcb in the cleaner head itself. If you plug them into mains , BOOOM
Had 3 customers do that this year already when attempting a DIY job