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How old is the microwave, and if when the microwave is running do you see the table turning inside?
Sorry for the delay in responding, have you checked the microwave has air circulating around it (for example the air vents at not blocked)?
Ok this points to a fault on the Hight Voltage circuit within the microwave.
Looking at eSpares, Ransom and other firms the HV PCB is showing as obsolete, the typical cost would be around £70. The HV PCB regulates power to the magnatron, and its likely this or the HV capacitor which has failed.
Based on the age of the appliance and parts being obsolete, I would recommend replacement rather than repair.
Is there anything else I can assist you with?