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if the noise is a loud buzzing type noise. its very possible your magnetron has failed. are you handy with a multi meter. it can be further diag. once removed and dismantled but microwaves can be very dangerous to work on. the magnetron I believe is bout 150 bucks
on a 16 yr old microwave no. the repair will cost as much as replacement. its barely worth it to fix yourself to be honest.