@SophieWright Is your internet down then, any device connected on a Wireless/Ethernet connection will show that when the Internet is down! See the link below about the lights first!
This link below provides information about the coloured lights on the various hubs that can help to see what is going on! If the system is also Full Fibre then the lights on the OR/CF ONT also require to be looked at!
https://www.sky.com/help/articles/hub-lights-explained-start
