If the fuse were blown, You wouldn't even get a display. If you're handy with a multi-meter, and feel somewhat comfortable making electrical tests, the first thing to check is whether the problem is coming from the low voltage (control) side of the oven, or the high voltage side (transformer, magnetron, capacitor and diode).
Unplug the oven and remove the cabinet cover. Before reaching into the chassis, discharge the capacitor by shorting between the two sides with a screwdriver or similar tool. It can store up to about 2000 volts, and can hurt you badly. A brief touch with your shorting tool is all that's necessary.
Disconnect the wire lead that goes from the power transformer (the largest component on your oven's right side (as you face the door), to the capacitor. Insulate it against any metal contact by wrapping electrical tape around the connector.
Set your meter to test for house voltage (the 200VAC range). Plug the machine in and select a cooking cycle. While it's trying to cook, place your meter's leads on the wires coming from the control board to the primary terminals on the transformer. You're looking for a reading that's reasonably close to 120VAC. If you don't get enough voltage, the problem is with the control board. If you do get the required voltage, the problem is in one of the high voltage components.
Write back with your results for further diagnosis.
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