How can you tell if the window motor is blown up in a 99 Jeep Grand Cherokee all but 1 window will not move and the doors want lock?

Add power direct from the battery. pls see... http://www.faqfarm.com/Q/What_is_wrong_when_the_front_passenger_power_window_motor_sounds_like_it%27s_going_to_work_but_then_stops_and_the_window_will_not_move_on_a_1999_Jeep_Grand_Cherokee