SD SD on TROUBLE SHOOTING Symptom Possible Cause Simple Solution No sound,no light 1.Plug is ont well connecled. 2.Power switch button is not turned on Check the plug whether into the power supply socket No sound, light on 1.Audio signal is not transmltted to speaker 2.Woofer wires disconnoctod Please check the wires whether under well connected Bad sound 1.The place is unfit for the speakers 2.Bad or incorrect speaker connections 3.