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As one of my old electronic instructors used to say, what goes in must come out. If you have 120 in but not out then the problem must be in the middle. Swap one of the other wires for the hot, or run a temp external. You can also switch the wires between circuits at the box to rule out everything.
Pulling new wires through conduit should not be too much hassle if it comes to that. Tie the old and new wires together and let er rip.
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