Audio from Macbook

Suddenly my Audio icon on the menu bar died, it turned grey and no audio is playing out from my Macbook. When i checked the System Preferences, it is only on Digital Output, Internal Speakers is not available for me to select.
BUT, when i use my headphone, the Audio icon comes back and audio is fine. However, i saw a red light in the Headphone jack??!!! :o
I have just upgraded the software but still the same.
What is happening and what should I do?

I have exactly the same problem. If I wiggle a toothpick nothing happens to fix the sound icon being greyed out and immovable. In the Sound system preferences only Digital output is available, no internal speakers. If I plug in a headset, it does recognize that and will output to them. When I unplug them usually the red light stays on until I 'reset' it by plugging headset in/out or by a toothpick. It just started doing this within the last couple of weeks.

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