Answer

well its sounds like your transfomer or magnetron may have gone bad, either one is a job that takes a trained tech to repair, prices for this repair will vary and can be expensive, replacing is probably a better option , this is not a job you can do yourself unfortunatly, this is what the gorverment warning says.

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Consumer Product Safety Commission

Electrocution Hazard with Do-It-Yourself Repairs of Microwave Ovens

CPSC Document #5061

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The U. S. Consumer Product Safety Commission (CPSC) warns against do-it-yourself repairs of microwave ovens. Each year, on average, four people die from electrocution trying to repair their microwave ovens. Microwave ovens use high voltage which makes it particularly hazardous for consumers to remove the cover and touch electrical parts. The possibility for electrical shock from a microwave oven still exists even after the oven is disconnected from the power source. Should certain internal devices fail, even unplugged ovens can cause serious injury.

The Commission strongly recommends that consumers have professionals repair microwave ovens because electrical appliances can be hazardous if consumers expose live electrical parts.

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/!\ WARNING

ELECTROCUTION HAZARD
HIGH VOLTAGE

Removing the cover of your microwave oven and touching an electrical part can kill you.

Have a professional repair your microvave oven! please consider replacement or service man to repair this, be safe, regards, XXXXX

Expert:	a1speedyappliance
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Answered:	9/7/2009

Home Appliance Technician

i own and operate a 1 speedy appliance here in tennessee.i am a certified appliance technician