More than likely you have the directional control set to Defrost. At this setting, the A/C compressor will run continuously. Move the selector to another setting, and see if the compressor stops running.
Bad compressor
Well you have to press the button that says off to be able to turn it off.
Press the Auto button or the Defrost button.
comp may cycle when you have the defroster on
Twice.
Dissconnect the ac adapter
Some a/c compressors cycle on and off to maintain a set temperature.
If you have the selector knob on defrost it will also run the air conditioner compressor.
Did you happen to move it to Defrost when you turned it off? The ac compressor also runs in the defrost cycle to keep the seals lubricated during the winter months when the ac is not used.
Possibly low on refrigerant, time to call a repair man.
because it is going through defrost cycle
It is normal for the compressor to cycle on and off If it is cycling excessively could be due to an incorrect refrigerant charge