(Full disclosure: I don't own a saber with sound)
Try holding the power button down for three seconds, if that doesn't work you should definitely email Ultrasabers. They have just about the best customer service I have encountered in a long while.
Also, please remember to acknowledge that you have read the rules,
http://www.saberforum.com/index.php?topic=117.0;topicseen. Welcome to the forum and I hope that a more experienced forum member will come by the thread and help you out!