It might be the power connector/power button ribbon connector...take off quick launch button panel detach ribbon cable by unlocking the connector tightening clasp be careful not to break ribbon cable...put it back in and wiggle it around abit see if speakers work if not go to ebay and search for quick launch button panel find one with speakers...perhaps 20 to 30 dollars.

I found a problem with the power button ribbon connector I put some scotch tape on the back of the ribbon cable then reinserted it and now she works!!!!!