PowerLite 7500C Multimedia Projector

Check that the volume setting is not turned all the way down and that the audio/visual cable is securely attached to both the projector and the audio source. Make sure the AV/Mute feature is not enabled. If it is, press the AV/Mute button one time to deactivate it. Also, the wrong source may be selected. Press the Source button on the remote control or control panel to select the proper source.