Whirlpool fridge model WF-NL300 ice

Question

whirlpool fridge model WF-NL300 ice maker not working. No water in icemaker. Black water supply tube that fills icemaker was frozed solid with ice. I thawed it in a cup of hot water. Unsure if line could be/is frozen above this point. Still no ice 24 hours later. Hear intermittent buzzing that sounds like water valve opening up too fill icemaker, but no water in icemaker.