There is a humming or buzzing noise coming from the kiosk computer or kiosk case.
Open the front door to your kiosk and inspect the CPU cooling fan (the large fan in the middle of the motherboard). Check if there is a wire rubbing up against the fan blades. If there is, gently move it and tuck it out of the way. If you cannot see the source of the noise, please open a technical support ticket HERE.