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How do I get my iMac to find my external speakers? My Altec Lansing speakers stopped appearing as an option in System Preferences.

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Hi Karen! Can you give us a little more information by editing your post? What speaker model do you have? How are they connected to your Mac? Did it work before? Since when did it stop? What version of OS X do you run (click  » About this Mac)? –  slhck Nov 9 '13 at 17:30
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