Need help with surround sound

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Hi Guys Im New Here As u can tell need help with my new surround system.
Just Bought A LG 42 inch tv model number pg300 and the home theatre kit also lg nt503th i have it connected through hd lead to tv and audio through a digital optical lead to my tv but am only getting sound through 2 front speakers and subwoofer nothing from centre speaker or 2 rear ones Any comments or help on this matter would be much appreciated thx
 
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