speaker problem
 

hello
i just got my hummer h2 back from the mechanics wh replaced the pump for the brakes and steering and realized as i was driving it home that the speakers ,which are Bose , don't work . No sound comes out of them but the radio display works fine . i can change radio stations or operate the cd player but no sound comes out of the speakers . i would rather not take it back to mechanic if its a simple thing that i can fix myself so if anyone has any suggestions or thoughts on this matter it would be greatly appreciated .
thank you very much.
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