You might have to move a Jumper on the Board(third Item in the Search).Here is a 
Googlesearch on the Subject.Not very clear,but thats Dell for you.BTW:Have you checked 
on the Dell Homesite too?

http://www.google.com/search?q=disable++pc+speaker+in+dell+optiplex&start=0&ie=utf-8&oe=utf-8&client=firefox-a&rls=org.mozilla:en-US:official

:)    werner

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