If so, your Apple computer may need service. Check to see if a red light is lit in the line-out port.Confirm again that all external audio devices and cables have been removed.If the Internal Speakers option does not appear in the Output tab and your computer is not a Mac Pro, check that Digital Out is present as in the image below:.If the issue continues through these steps and Internal Speakers remains the selected option proceed to step 5.If the Output volume slider is low or the Mute box is selected, raise the volume slider or deselect the Mute box and test again.If Internal Speakers is present but not selected, select it and test again.For Mac Pro computers, proceed to step 5. If Internal Speakers is not an option proceed to step 4.Open the Sound pane and the Output tab, then select Internal Speakers as in this image:.Open System Preferences from the Apple () menu, the Dock, or from the Applications folder on your hard drive. ![]() Remove any external audio devices and cables from the USB, FireWire, or 3.5 mm audio ports.If you are still having issues after you have confirmed the proper version of Mac OS X is installed, make sure the computer is set to play sound from the right source. If an incorrect version of Mac OS X is installed onto an Apple computer, a number of issues-including issues with audio-could occur. Confirm the correct version of Mac OS X is installed on your Apple computer
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