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The noise your describing sounds like either the icemaker or the fan behind the back panel in the freezer is jammed or hitting ice. I would unplug the icemaker and see if the noise continues, if so then either unplug the unit for 24 hours and allow everything to thaw out, or if you're handy you can remove the back panel inside your freezer and thaw all the ice/frost behind this panel since it's apparently interfering with the fan blade.
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