Digital sound output only after using Headphones

i used my MacbookPro 17 2.66
with headphones to listen to music and after i removed headphones there is a red light in the headphone port and only digital sound output option in system preferences control panel
If i reinsert headphones, headphone output reappears
Where are my internal speaker option gone
i have a time machine backup
Can i just replace sound preferences
Thanks

Generally that means your headphones' plug is not exactly to dimensional stands and has jammed the internal connector in the jack to the "mute" position. The plug's tip-to-shoulder distance seems to be the variable.
I've found with my MBP that, with non-standard plugs, inserting them only until they function--not until the "stop shoulder" hits the MBP case--prevents this. I have an old and cheap set of external speakers whose plug works perfectly. A patch cable I use to connect to my desktop sound system has a non-standard plug, and I have to leave the plug slightly out of the jack to prevent the problem you see. Again, insert until you hear proper sound to the device, not by feel. I've no problems with the plugs falling out using this technique.
The "official" fix is a new logic board but most people are able to free the internal contact by inserting a plus into the jack and gently wiggling it in the horizontal plane. One person recently said he freed his with a wooden toothpick.
If you use anything other than a standard plug to manipulate the jack, be certain it's non-conductive. BTW, if you use the "Search Discussion" option in the upper right of this page and search for "red light" (use the quotes) you will see a number of threads here on the subject.

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Digital sound output only after using Headphones

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