If DVD Player is open with AC3 audio selected, other kinds of audio (such as system beeps) may not be heard.
Symptom
System beeps and other audio alerts are not audible.
This occurs when DVD Player is open and the option for AC3 audio selected, whether or not a disc is inserted or playing.
Solution
Quit DVD Player to hear other system audio.
To learn how to change the audio options for DVD Player, see technical document 86438: "Power Mac G5: Selecting Audio Output for a DVD Movie".