Question about Apple MacBook Mac Notebook

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Speaker volume Internal speakers are not working. Sound comes only if there is an external speaker plugged in or headphones. I have checked the speaker section in System Preferences and the MUTE is not checked and the volume is up. In fact, the speaker icon in the top right corner is shaded as if it isn't on. When I use the keys to turn the volume up, there is a small crossed circle under the volume saying that the speakers are not engaged. In the output section of systems preferences there is a choice for DIGITAL OUT, BUILT IN OUTPUT. When I click on it it says that "the selected device has no output controls".

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This is a common complaint. The key to the diagnosis is that your MacBook is saying "Digital out, built-in output" instead of "Internal speakers, built-in output."
The output jack on this model supports both traditional and optical plugs. A mechanical sensor inside the jack tells it which is inserted. The problem is that the jack is somewhat fragile, and some plugs can nudge the sensor out of position, in which case it thinks an optical plug is permanently inserted.
If one has great repair skill, one can sometimes jiggle the connector back into position with a small pick (make sure the power is disconnected and the battery is out, if it is removable). Sometimes inserting a conventional plug into the jack several times will correct the condition. Otherwise, you should bring it in for repair and insist that it is a widely-encountered product defect.
More information at forums.macrumors.com.

Posted on May 16, 2010

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