There could be many reasons why your home theater turns on but no sound. Some of the more common reasons are a bad audio cable, a blown speaker, or an incorrect audio input setting.Before you begin troubleshooting, make sure that all your cables are properly connected and that the power cord is plugged into an outlet and turned on. If everything appears to be in order, try changing the input setting on your TV or audio receiver. If that doesn't work, then it's time to test the speakers one by one. Start by disconnecting all of the speakers except for the one you want to test. If you still don't get any sound, then the problem is most likely with that speaker.

One common reason why a home theater may turn on but produce no sound is that the speaker wires are not properly connected. Make sure the positive and negative terminals on the speakers are matched up with the corresponding terminals on the receiver, and that all of the wires are securely attached. If you're still having trouble getting sound to come out of your home theater, consult your user manual or contact the manufacturer for more help.