Cannot hear any sound through my external speakers - help!

I'm running 10.6.4 on my imac 27". Can hear sound though the internal speakers, but even when I plug externals in and restart I can't see any option in the sound system preferences to let me hear through the external speakers. It's odd. Can anyone help?

More information will help.
Is this a problem that just started for you, or have you never been able to plug in headphones or external speakers and have them work?
Are you sure you are plugging into the correct jack on the computer? On my slightly older iMac I sometimes reach around to the back and hit the wrong jack.
When I open "Sound" in System Preferences and hit the "Output" tab, I see "Internal Speakers" listed. Then when I plug in my headphones the "Internal Speakers" automatically changes to "Headphones."
Is this what you see on your computer?
Good luck.
Arch

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Reminder: Please select the "Accept as Solution" button on the post that best answers your question. Also, you may click on the white star in the "Kudos" button for any helpful post to give that person a quick thanks. These feedback tools help keep our community active, so you receive better answers faster.

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Cannot hear any sound through my external speakers - help!

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