No sound and red light

I have no sound and when I turn the volume up there's "a circle with a line through it" there is a red light coming out of the earphone socket. I tried unplugging it and it worked but I want to use my headphones sometimes and when I take them back out it goes back to the red light. I tried changing the settings to internal speakers but when I went to "Choose a device for sound output" there was only "Digital Out". How do I select internal speakers when they're not there, how do I fix this problem?

So my internal speakers stopped working around 9-12 months ago, along with it the all-too-familiar red light in the headphone jack. Tried all the toothpick (actually recommended by an Apple tech), headphone in-and-out, paper-clippy, throw salt over-your-shoulder ideas posted out there; all to no avail. Nothing would get that switch inside to pop back from it's position, and let my computer know that there was nothing plugged into the jack. After all that and NEAR A YEAR of no internal speakers, they inexplicably started working again the other day. I think what happened was that I had neglected to notice that my headphones were plugged in still when I tried to put my laptop in the case, and slightly tweaked the headphone jack port when the headphone jack hit the side of the case. Whatever you do, don't let anyone convince you that it's a logic board or I/O board failure. It seems very likely an obnoxious flaw in the jack's design, and I'm not surprised many people can get it working again by poking around and getting the switch inside the jack to return to its position.
This computer has been a workhorse for me and OSX is a great design, but If I were to issue one complaint about Apple it would be to stand behind thier hardware better (I've had other problems before too). I feel like they could have issued a proper procedure to fix this problem so that everyone with issues like this doesn't have pull thier hair out searching forums for solutions and getting unnecessary expensive repairs.

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