My Motor or servo isnt working

[Silverado87]

ok i just installed the stilleto all i have left to put on is the rear part but i can still install the motor with the wires and the motor will just spin and rev. it aint working. same with the servo. atomic mods said the same thing to try and test the servo when the battery wires are connected and it dont work. no jittering either. whats wrong. how can one fry the mainboard? i think i might have