Speakers won't work after headphones were plugged in

I plugged my headphones in briefly and now no sound will play out of the computer's speakers when the headphones are taken out. I plugged the headphones in a second time to see if the sound would work with those still and it did. I looked in System Preferences in the sound section and it won't let me change anything, in Output it just says Digital Out in the list of selections for which to output sound and won't let me click on anything.

Is there a red light emitting from the port? It sounds like digital out in activated. This could be caused by a hardware issue with the port, or something in the software. Here are a few things to try:
Try first: Repeatedly insert and remove the headphone jack until sound returns to the built-in speakers. Make sure you have something playing constantly, such as a song in iTunes.
If that doesn't work, try this: Make sure the headphones are detached. Attach a usb device (such an an iPod) to the USB port closest to the headphone/audio out jack. Insert the headphone jack, then remove the headphone jack.
If you are seeing a red light, digital out is definitely enabled. My guess would be that it's a hardware issue. Somewhere in that port, something is getting stuck, and telling the MacBook that a digital device is connected to that port.

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