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Either your switch is not making a contact internally or the wire that runs from the motor to the switch is loose or not connected, or that speed is burned out on the motor. Those motors have a separate wire for each speed, so it's either not getting power to the motor from the switch or the that speed setting is burned out on the motor its self. I would just work around it and use the low or high setting until you can take it apart to test if the motor is getting power from the switch, if so then the motor is bad, usually the bearings go out on the motors before the wiring does. Unless your motor was on medium and was stopped for a long period and overheated that setting which will melt the wires and cause it to not work. They have a safety switch on the motors now to keep this from happening.
The clicking noise is the sound of the high ionizing voltage 'shorting' due to dirt or humidity or both which provides the pathway for discharge. Cleaning and completely drying the filter(s) does not always help, in this case switching the unit to a lower operational speed can mitigate this problem. New filter(s) may be needed to resolve the clicking.
A faint buzzing sound is normal - - that's the high-voltage plasma discharge simulating lightning in a thunderstorm. If the room is dark you should be able to see a faint bluish-purple glow of the metal grid on the plate(s) inside. This should somewhat louder as you increase the setting.
It should not really be so loud that is stands out in the background of normal noises (refrigerator running for example). If the buzz is loud - - like something is shorting-out internally (loud crackling sound), that would signal a different problem - - I'd need more details about what you're observing. Approximate purchase day, specific model, number of plates, general condition of the interior would all be helpful if you deem the buzz to be too loud for normal operation.
If I can be of further assistance, let me know. If this helps or solves the issue, please rate it accordingly.