No audio from internal speaker

My Macbook suddenly stopped recognizing its speakers. When I go to system preferences, the only listing under "output" is "digital output". I can use headphones, but when I unplug them, the red light remains on in the headphone jack and the speakers won't work. The speaker icon is grayed out.
I have tried removing the battery and zapping the PRAM. I have also tried going into the library and trashing all the audio settings. I originally thought this was a problem associated with 10.6.3 update, but apparently, that is not the case. I even took my computer in to the Apple Store. They ended up replacing my hard drive, which did nothing to solve my problem (but gave me days of reinstalling applications ahead of me).
Apple tech support via phone have not come up with any solution.

Same thing just happened to my 3 year old MacBook... I fixed it after referencing the URL below and realizing one of the "tabs" in the audio port was causing the problem. After about 8 tries of working the ear pod jack in/out of the port (with red light glowing), the light finally went away and my internal speakers now work. I've seen some people recommend taking a toothpick and gently pressing down the tabs in the audio port, but that didn't work for me. Good luck!
http://iboughtamac.com/2007/02/09/my-macbook-speakers-stopped-working/

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