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If the icemaker won't make ice, you'll want to open the door so you can see the icemaker. Under the icemaker head there is a small plastic button which you can press and hold for 15 seconds and that should force the icemaker through a harvest cycle. Press and hold this button and see if the icemaker rotates. If the icemaker doesn't rotate and act like it's dumping the ice, you just have a bad icemaker and it needs to be replaced. It's possible it went bad from no water being hooked up and it continuously cycling over the last year or so.
Other than that, if the icemaker cycles but no water enters at the end of the cycle, possibly one of the water lines going to the icemaker is frozen due to air in the water line from first hooking up the water. You'd want to disconnect the water line going to the icemaker and blow through it to make sure it's clear, otherwise use a hair dryer to thaw out the line if needed.
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