External speakers/headphones won't work

I cannot get my iMac to send sound out the headphone jack either to headphones or to my Klipsch ProMedia 2.1 THX system. Several years, and iMacs, ago, I used these speakers without problem, but now I cannot get it to put sound out through anything but its own internal speakers. I'm running OS 10.8.3.
The Klipsch tech support thinks I need a driver from Apple. Any ideas?
Thanks.

Sometimes the Jack just gets messed up & sime have carefully used a wooden toothpic or such to fix it.
Long shot, but...
Open Audio Midi Setup in Applications>Utilities, see the input & output options & KHz setting there, some things will change it for their own use, then not set it back.

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