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Put a glass of cold water in it as see if it heats up? All microwaves have a timer so that after cooking the internal fan stays on to remove cooking smells and condensation from the chamber. It should however turn off after about 5 minutes as long as the door is closed. The plate should only rotate when a time is set and the cook button is pressed.
If everything else is working but it won't heat the food, the causes are the magnetron "common failure" or the high voltage capacitor and diode can be a factor, the three work together to heat the food. Depending on the nature of repair it can be close to the cost of a new microwave oven.
The vibration can be due to either the transformer which is getting loaded when the magnetron is ON or it can be the vibration of the turn table - possible fault in the drive mechanism or irregular movement. If this is the transformer check the voltage and if it is heating up then it can be faulty , if not the mountings of the transformer can be tightened.
Also the turntable movement drive can be reset.
There is a coupler that connects the turntable motor to the plate. It's the square or odd shaped object in the center of the microwave after the turntable is removed. You can try to pull it up from the microwave to see if it is broken or if it will turn by hand, it is probably broken.
Dont have many smegs where i am, but smeg is a decent unit, so i would think if there is no heat, look for a reset button (over temp. protection). possibly located at the back where the elements are wired.