Power Mac G4 (FW 800): Apple Pro Speakers Not Recognized at Startup or Wake From Sleep

Symptom

A limited quantity of Power Mac G4 (FW 800) computers may display this message after the computer starts up or wakes from sleep:

"Speaker Connection - The device plugged into the Apple speaker mini-jack cannot be recognized. Remove the plug from the jack. Then plug it back in and make sure it is fully inserted."

Figure 1 Alert message

Note: While the computer may exhibit this alert message, the Apple Pro Speakers work correctly.

Solution

1. Close the alert by clicking OK.
2. Make sure the speaker connector is fully inserted into the Apple Speaker sound output port.
3. Restart the computer. If the message reappears after the computer has restarted, the logic board may need to be replaced.
Note: It may take up to nine seconds for this message to appear after the computer has started up.
4. If the message reappears after restarting the computer, contact a local Apple Authorized Service Provider to determine whether the logic board needs to be replaced.