Disabling the auydio jack altogether

I'm having a problem with the audio output jack-socket on my 17" powerbook (well, yes, I know we all have problems with those, but my problems have arrisen despite my being careful never to actually use the useless socket, in the first place )
Let me explain. Despite the fact that I have never used it, in recent months the headphone socket has taken to deciding that there is a headphone plug plugged into it, at random moments, during the day, and disabling the main built-in speakers. You can immediately tell when this is the case, because the red detector light comes on, inside the socket housing. I'm guessing the internal detector switch within the socket is engaging itself and telling the operating system that there's a set of headphones plugged in.
Until recently, I've had success at correcting this fault, by simply plugging and unplugging a set of headphones into the socket until the detector within the socket releases itself, again and I gget my internal speakers back.
Those days are, it seems, over. The socket has jammed itself into the on position, and now, no matter what I do, it will not disengage. This is especially annoying, since I've had enough experience with Powerbooks, in the past, to know that you must never - no matter what else you do - try to use the headphone sockets on them . I've actually avoided using the stupid socket, and still it comes back to haunt me, like some vengeful soul...
So, I'm asking: has anyone ever found a way to actually stop the operating system from probing the headphone socket? I just want the internal speakers back: I don't care about the headphone socket.

Thanks for your input Roger. However, I am still not convinced it is a hardware issue.
I/O devices are controlled by a device driver (i.e. a kernel extension or kext) which are loaded at system startup. As such, the kext supporting the internal speakers and headphone jack should be loaded at startup, but when one is active the other one is inactive. Since my headphone jack is active the speakers are inactivated and I cannot select them as the output source. However, if I could disable the kext supporting the headphone jack (or modify it if the same kext handles both outputs) I should be able to use my internal speakers again.
Cheers,
Zoran

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