When you plug in a headset two things happen. 1. a prong is bent back so that the laptop speakers are disconnected and 2. the headset is connected to the audio signal. When you un-plug the headset the the prong springs back and reestablishes the speaker connection. A number of people blame Ipod headsets for having plugs that are longer than standard and damaging the prong so that it can't spring back. Some people report that rapidly removing the headset plug has fixed the problem.
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