Check the wiring running to all your other speakers and ensure all the other speakers are playing. If the other speakers are working fine, then check the line running from your receiver to the bass. I am using an Insignia 15' Subwoofer cable to connect my receiver to my Core Series 10" bass. Check to make sure you have a solid connection. After checking all wires and speakers for connectivity, make sure you turn the bass itself on. The Sony Core Series 10" has its own power switch located on the back of the speaker near the bottom (its a push button switch). You'll know its on when you see a green light appear on top of the bass near the rear next to the vents. If you have the receiver connected correctly to the bass, AND you have the power switch on the bass pressed in and you see NO light on top of the bass, you have a power problem with the bass and you will need to get it fixed or turn it back in. If you have everything connected correctly, you DO have the power switch on the back of the bass pressed, and you DO see a green light on top of the bass but still have NO sound, you have a blown speaker in that subwoofer.