Little Giant Submersible Fountain Pump "motor hums won 39" Questions

...hums but won't pump this sure sounds if the impeller is blocked and not being able to turn ,Dont let it run this way , can dammage motor of pump , remove intake cover (unplugged) and wash out ...

...hums but isn't circulating water. sounds like something is stuck. awwhhh it sounds as if you stored your pump dry all winter long ill bet, well ya just cant do that after it pumps salt water ...