Continuous Hmmmm

DDJ-SB2 Continuos Hummm: I’ve read a few treads in the forum on recommendations to fix the hum and nothing works. The hum is more of a high pitch static sound that only occurs when the unit is connected. Wires, plugs, USB cords don’t matter. It’s quit annoying since the sound is very loud when no music is playing. Please help. (Djmas109@gmail.com)