Hi there, I'm really hoping someone can help me.

I'm a new owner of the HT ST5000 sound bar, and am looking to understand, how you can find out if you are outputting dolby ATMOS or dolby 5.1. I have searched the web, and other forums and am being told that the display button on the remote handset will give you this information. However when I press the display button nothing works at all, could the button be broken?. I'm also playing dolby ATMOS content on Sky Q and was hoping for a more immersive experience, bit disappointed.....