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NO AUDIO SOUND COMMON TROUBLESHOOT STEPS- 1. TURN OFF u0026 ON TV OR CABLE BOX OR SURROUND SOUND THAT'S A SOFT RESET 2. CHECK FOR LOOSE WIRES IN THE BACK 3. HARD RESET BY UNPLUGGING THE DEVICES POWER CORDS FROM WALL THEN WAIT 1 MINUTE FOR CAPACITORS TO DISCHARGE INSIDE THE UNIT, THIS WORKS AFTER POWER OUTAGES. 4. USE DIFFERENT AUDIO CABLE OR HDMI 5. CHECK ALL INPUTS 6. SEE IF ITS ONLY CABLEBOX NOT GETTING AUDIO JUST PLAY DVD IF YOU GET SOUND THEN ITS MOST LIKELY COMING FROM CABLEBOX. 7. TURN OFF ANY DEVICE THAT FEELS HOT, LET IT COOL DOWN, MAKE SURE HEAT VENTS OR UNITS FAN IS NOT COVERED OR BLOCKED IT WILL OVERHEAT AGAIN, HD DEVICES NEED AIRFLOW. 8. CALL TECH SUPPORT Bose 1-800-380-4831