IMac :: External Speakers Stop Working?

Jan 3, 2010

2007 iMac Snow LeopardAny idea why my external speakers would stop working?
This happened after I unplugged speakers from outputand plugged in headphones. After done, when I pluggedspeakers back in it stopped working. Headphones no longer
work either. Internal speakers still do, though.I went into preferences and sounds. The external speakers are no longer showing up. Built in output is the only option available. I unplugged everything and turned everything off. Plugged them back in and turned the mac back on. Nothing.

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Info:
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ITunes :: Airplay Can't Connect To Remote Speakers Or Multiple Speakers When Speakers Are Visible In It

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I have iTunes 10.6.1 (7) an Airport Extream Version 6.0 Airport Utility (600.92) That I use with two airport express stations, an Apple TV 2nd Generation with latest software up date.  Also have Ipad 3rd Generation and two I phone 4's. Issue:  After installing the latest Airport Utility software update I'm unable to connect to my remote speakers in iTunes.   The speakers are visible in the pop up menu but iTunes times out when trying to connect.  If I use remote to select Apple TV and then via Apple TV select my Computers Library I'm able to play music on the Apple TV / Home Speakers... but still not the Airport Express Stations. 

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