- If there is nothing plugged into the headphone jack or USB ports, under the Output tab of the Sound system preference pane should be set to the internal speakers.
- If not, and if nothing is plugged in, try plugging in headphones or external speakers. Restart the computer. Remove the device.
- Reset PRAM (Press the power button, then hold down the Option-Command-P-R keys until you hear the startup chime at least one additional time after the initial startup chime).
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