Mac OS X 10.0: No Status Bar for Keyboard Volume Adjustment

Volume adjustments made from a keyboard work, but a graphical representation does not appear on screen.
Symptom

You can adjust the computer's volume from your keyboard, but a status bar representing the volume level does not appear on screen.

You may expect to see such a status bar if you are accustomed to Mac OS 9.


Solution

Update to Mac OS X 10.1.

For related information, please see:

Article 106213: "Mac OS X 10.0, iBook, PowerBook: Display Brightness and Volume Keys Do Not Respond"
Published Date: Feb 17, 2012