Hi all, I have Xbox 360 Slim, my TV and my home theater LG BH6420P. My current connections are [*] My current connections are•Xbox -> TV via HDMI [*] Home Theater -> TV via HDMI [*] TV -> Home Theater via red/white audio cable (2 channels only) [/list] With this settings, I can hear game audio from my home theater system. Now I bought an optical audio cable, I changed connections to [*] Xbox -> TV via HDMI [*] Home Theater -> TV via HDMI [*] Xbox -> Home Theater via optical audio cable. [*] TV -> Home Theater via red/white audio cable. I leave it connected for testing purpose. [/list] With the change, I can no longer hear Xbox sound from my home theater. The Xbox audio output has been set to 5.1. If I switch Home Theater to use red/white cable it still works fine. I also tried to connect TV -> Home Theatre via optical audio cable, but still no sound. I have 2 questions here [*] When Xbox connects to TV via HDMI, does the optical output still works? [*] Anyone ever tried to connect Xbox with LG system successfully before? [*] [/list] Any thing I missed here? There is not too mcuh settings I can use in LG system. Thanks for any input.