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Ethernet cable jack points installation

We have set my parents up with a new TV & AV receiver (LG & Yamaha) but need wall jack points installed so there aren’t Ethernet cables running across the lounge floor, We’ve also bought an optical cable to connect the TV to the receiver for movies etc but not sure why it’s not working so some trouble shooting help there would be great. New TV and less than 2 yr old Yamaha receiver that did work fine for us before with an optical cable. We’re here till Monday so really hoping someone can install Monday morning? Su ridge Estate, Welcome Bay.