My MacBook Pro with Lion 10.7.2, only audio on the headset, and speaker mute. With Windows, the audio works in speaker and headphone jack. What is the problem? What's the solution?

My MacBook Pro with Lion 10.7.2, only audio on the headset, and speaker mute. With Windows, the audio works in speaker and headphone jack. What is the problem? What's the solution?

There is probably a red light on inside your headphone port, indicating that the analog/digital switch in there is stuck in the digital position. Insert a headphone plug and wigle it around, especially in the horizontal plane, as you insert and remove it several times. This will usually unstick the switch and restore normal operation. If it doesn't, the machine will need to be repaired.
This has been a fairly common problem, but in most cases it is easily cured as described above.

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