Audio output in one earphone/speaker?

I've recently had a problem with my MacBook. When anything is plugged into the audio output, sound only comes out of one speaker or headphone. I know it's not the headphones because they worked fine with the macbook previously, as well as still working with other devices. I did find that I can sometimes get output in both headphones/speakers if I only put the jack part way into the socket. Could this be a problem with something inside the laptop itself? Or could it be software related? Sorry I have no idea myself, I'm not very good with this sort of thing...

Mikey--
Several things--
Check your output for sound. System Preferences>Sound>Output...see if your balance is equal.
If so, you may have a loose headphone jack. Might want to try wiggling the plug gently and see if that gets you sound.
If that's the case, you may want to have Apple take a look at it.
Best of luck--
Doc

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