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my headphone jack output stopped working a couple days ago. As in - when I jack a cable (or headphones) the sound comes via the built-in speakers.

On the installed Windows (Bootcamp) it works OK (sound coming out via headphones when jacked in).

Any ideas how I can troubleshoot this?

The OS is Lion, freshly updated (update after the problem first appeared).

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Have you checked the Sound pref pane in System Preferences? There's a tab labeled "Output" where (I'd expect, as I don't have a portable in front of me just now) you can switch output between built-in speakers and the headphone jack. If the first toggle doesn't work, toggle it again. – bneely Dec 2 '11 at 22:41
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So, the problem sort of went away by itself, very likely due to @bneely's comment, I messed with some settings but can't remember exactly. In any case thanks @bneely! – Vukašin Dec 3 '11 at 14:05

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(posted as an answer so you can accept it and mark this issue resolved)

Have you checked the Sound pref pane in System Preferences? There's a tab labeled "Output" where (I'd expect, as I don't have a portable in front of me just now) you can switch output between built-in speakers and the headphone jack. If the first toggle doesn't work, toggle it again.

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