USB ports

  1. 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.
  2. If not, and if nothing is plugged in, try plugging in headphones or external speakers. Restart the computer. Remove the device.
  3. 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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