Make sure that your speaker is plugged into a working AC power outlet using its power cord.
As per your first time installation, plug one end of the power cord into the power jack located on the bottom of your speaker, and the other end into a power outlet.
Note: In some regions, several power cords may be included. Use the power cord and plug that is applicable to your region. Only connect to the correct mains voltage, as shown, on the bottom of your speaker.