[leegreen]

Are the heater hoses getting hot as the engine warms? then there is water flow. Flow in the radiator will only start once the thermostat opens

I'd look for a stuck thermostat or obstruction somewhere. A water pump that is failed so hard as to stop pumping would probably have other issues...like a seized pulley and a large puddle. It is possible the pump spit the impeller off the back, just not likely