Fixing issues with a home theater system can be done through a series of basic troubleshooting steps. First, check the volume settings of your home theater and ensure they are properly adjusted. Next, ensure that the system is on the correct input setting. To verify if the speakers are working, use test tones. Examine the cabling to ensure all connections are tight and secure. If the sound issue persists, disconnect and reconnect the cables, making sure they are inserted correctly. Additionally, make sure all components are powered on and functioning properly. Finally, if the problem continues, consult the user manual or contact customer support for further assistance. Remember to check for loose or faulty cables as they are a common cause of home theater system issues.