Volume control not working when speakers/headphones plugged in.

When my external speakers or headphones are plugged into the back of my iMac, the volume control won't work. A "no sound" icon appears and the volume slider will not move. When I unplug speakers or headphones everything goes back to normal. All updates are current. My "Audio MIDI Setup" says, "Audio Output....Output Not Supported." Repairing disc permissions was run too. Any ideas?

Hi Paul
*First off:*
Open System Preferences > Sound and select the Output tab. Now plug in your external speakers or headphones, do you see the Device Name change from Internal Speakers to Headphones?
*If nothing:*
Then try another Account, preferably your Admin. Account if your logged into another.
*Still nothing:*
Check the settings in other third party Audio programs you may have installed?
*If still nothing:*
Reset the SMC > http://support.apple.com/kb/HT3964
+(as per the instructions at the bottom of the article)+
and
Zap the Pram > http://support.apple.com/kb/HT1379
*Then if you still get nothing:*
Take it in for service and have it checked for a hardware problem.
Dennis

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