Did you pull the hose off the tub and check up in the tub for sock or small piece of clothing that may be trapped there? If the water can't flow from tub to pump, it won't pump out.
You said the pump was humming, did you take it apart to see if something was inside? Sometimes the impeller also falls off the shaft. If so replace pump.
If it is clear and still humming, I would hook up a cheater cord (should be 110 volt) and see if the impeller is turning, if not you'll need a new pump.
Hope that helps, others may have more ideas.... Rodge