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LG Home cinema keeps prompting Fibre Optic Cable - Help :(

Hi All,

Please can someone help me with the following.
I have an LG7430P home cinema system and have just purchased a new Samsung TV.

I have the sky box and the ps4 going into the Home cinema and the HD out cable goes into the TV. Problem I have ius I tried to fit the fibre optic cable but no sound came out so I removed it. Trouble is every time I try and switch channels the home cinema prompts me with the message 'Enjoy audio via another device via optical input' even though I have removed the cable.
It is driving me and the kids mad but no matter what I do I cannot seem to get the home cinema to stop doing this.
Any help would be HUGELY appreciated.
Thanks, Matt

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