Hi @glennflanagan
Try connecting the 360 to a TV HDMI port without ARC. If you are connected to a HDMI ARC connector on the TV try connecting to a non ARC HDMI connector, using ARC has been a problem for some people.
Have you set up the HDMI control on your LG?
I have a NANO LG so the settings will probably be slightly different to your LG, however on my LG I had to perform the following.
Settings > All Settings > Connection > Device Connection Settings > switch on Auto Device Detection, and Simplink, and Auto Power Sync
Have you paired the Yamaha AV receiver on the 360?
On the 360 go into Settings > Audio & Video > Pair remote with devices > then use the audio set up to add the Yamaha. You can either enter the model number or use the key testing set up. If using the key testing set up it's best to try a couple of extra "correct " responses as the first one isn't always fully functional.
DaveI don't work for Virgin Media.
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