I've disconnected box from TV, connected aerial to TV and run auto-tune, which has successfully picked up all digital channels.
I've done that, reconnected aerial to box. Still not picking up any channels.
I'm not sure if I did a factory reset (it might have been just the Smart Hub reset). It's very difficult to get it to do anything now. I loaded a DVD but couldn't get it to play. It looks like the source is set to TV rather than HDMI1, but is not allowing me to change the setting.
No. The "weak or no signal" pop-up now just overrides everything.