ICE MAKER DOESN'T MAKE ICE

I shut the water off under the sink and removed the back piece on the refrigerator, unscrewed the water valve, cut the ends off each plastic hose and reinserted into the new water valve. Then rescrewed the water line into the new water valve and turned on the water. Unfortunately, I was not able to get water out of the door and the ice maker still doesn't make ice. While this was an easy procedure, it didn't help me. I'm not sure I needed to replace the water valve.