Sounds like a short across the mains input on the power supply/ or triacs shorted out on fuser driver pwb,
before replacing the power supply (needed) you may also want to replace the fuser unit assembly as a whole as the problem may well have originated from here. ( I would suggest at this point if your toner supply is low for this machine -that it is just as cheap to replace the machine as it is to replace the power supply fuser and toner
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