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MacBook Pro (13-inch, Mid 2009): Pop or noise when using analog audio output
You may occasionally hear a "pop" or sudden noise with the analog audio output on the MacBook Pro (13-inch, Mid 2009) when you wake the computer from sleep and the audio output is set to Sound Input.
To avoid this issue, make sure to select "Use audio output for: Sound Output" in the Sound panel of System Preferences before putting the computer to sleep.
To select this preference:
Choose System Preferences from the Apple () menu.
From the View menu, choose Sound.
Select the option "Use audio port for: Sound Output".
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