Suddenly no sound output from speakers ?!? Option vanished?

My sound suddenly stopped working. I have never had problems with it before.
When I go into Preferences > Sound, and select Output tab, the only option is "Digital Out - Optical Digital Out Port".
There is a red light glowing out of where the headphones should go, but with nothing plugged in there, there is no sound through the speakers.
I have NEVER used any sort of optical sound device, so I have no idea how this situation came to be or how to fix it?
If I plug in headphones into the jack, the Sound Output Tab changes to "Headphones - Headphone Port", and the sound works through the headphones, but when I unplug, it switches back to the Digital Out- Optical", and the built in speakers never work or appear as an option?
Any ideas?!
Mark

OK - this is weird - I tried rebooting and unplugging headphones several times, and repeated this multiple times over several hours last night, but the red glow started again immediately. I left MacBook asleep all day today, and when I came back and opened it up, it was playing through the speakers?!
So I'm not sure I get it, but it seems to be OK for now - thanks!

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Hi, I've Mac Book Pro 15" with Retina display. Yesterday suddenly the sound output from my Headphone is not working. When I tried to solve this, I've noticed in system preferences it's jumping from Internal speakers to Head phone and vice versa. Can anyone help me on this issue please? I am using the original Apple Headset only.
Thanks
Babu
<Re-Titled By Host>

Tell us:
OS X version ?
What may have changed prior to the onset of the issue of "... suddenly... not working..." and " ... preferences ... jumping from ..." ? Software added, upgraded, updated?
what precidely do you mean by " ... preferences ... jumping from ..." ?
ÇÇÇ
EDITadded
I see that your Question has languished for some period of time without response. You have posted your issue in Using Apple Support Communities whose topic is 'How to use this forum software's interface, features and/or how to find what you wish'. It is a relatively low traffic and inappropriate forum for your problem. I will ask our Hosts to move it to " MacBook Pro " where it may get a more rapid response from your fellow users.
endEDIT

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Message was edited by: CaptTB

Suddenly no sound output from speakers ?!? Option vanished?

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