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Sorry I don't have a pic but troubleshooting a power supply that won't light up, and swapped another and that won't either

Monitor powers up great. Pcb gets no power and no power coming off 5v terminals of psu…so walking back in found the ac lines running to the AC ins of the power supply are only putting out 50v vs 120v

Any idea on why this would be? Not the fuse as it has more than 0, inside filter? Bad cord wire? can't figure out why it's stepping down so much..I may just rewire it all..
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