keel problems
only 2 things I can think of. Either the release mechanism of the winch isn't working and not allowing the cable to un-wind, even with the handle turning, or there may be a build up of marine growth in the trunk preventing the keel head from swinging up into the trunk. The laws of gravity say the 600 lb. keel should go down. Looks like you'll have to haul out and inspect to find out. good luck