WP6000 5.1 surround sound w/Inspirion 530s

I recently purchased an Inspirion 530s with the Dell WP6000 5.1 surround sound speaker system. The system works well except that the rear (wireless)speaker is not on when I play music/videos etc. It does work when it is tested by the system. I have the most recent driver. Any ideason how to make this speaker work? Anyone else have this problem? :smileyhappy: