We have a black box and a stick, neither are working. The TV guide/entertainment/movies are listed but nothing will load.. just the little coloured balls going round and round.? I've even done a factory reset but it's still not working!
Have you tried powering off both your Now TV box /stick and router for about 30 secs to see if that makes any difference ?
Yep made no difference!
Perhaps go through this step by step trouble shooting help guide.