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Hi, I have an Acer Aspire 4830T , I have been using the computer over 1 years and it worked great the sound quality was awesome. However, recently my Dolby speaker is not working anymore (Dolby Home Theater- Professionally Tuned) I didnt upgrade my computer to windows 8 or something , the computer is just the way it was . oh and I even rebooted my computer but it didnt slove the problem .