It sounds like the motor is dead and with the 6091 the on cycle is too short for the alarm to come on. The magnet and prop are one unit and spin in the bearing at the bottom of the well. Not much can be done in this case, the pump is 9+ years old and is just dead and the motor block for this model pump is no longer made. The 6105 is the current equivalent. There is an upgrade kit 6100.015, which is a 6105 with no magnet holder or wide flow housing, these are slightly cheaper than a complete pump but they are out of stock at the moment.