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This is a mechanical switch inside the headphone jack, it is not a "software" detection sensor or anything. What happens is that when your headphones plug in, this switch "routes" the sound through...

The headphone input jack is stuck, there is a small switch inside the jack which shuts off the speakers when headphones are plugged in. When the headphones are pulled out, the speakers turn on again....

I have an HP dv6000 series laptop and I am having the same problem.

I can hear sound when plugged into either headphone jack (theres a regular one and the SPDIF) just not out of the speakers.
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