bought myself a new now smart tv box to replace my other now smart tv box that broke but cant get nothing to appear on screen just says no signal yet when i put old one back on it comes on any suggestions please as now tv live chat has been no use
When you tried the two new smart boxes was there a purple light or blinking light shown on the front on both boxes ?
I know you say that you have tried everything, but have you swapped the smart box onto a different HDMI port on your TV and also used a different HDMI cable (even though your older smart box displayed a picture on your TV screen).
Have you got a second TV in the house to temporary see if the new smart box displays the initial NowTV setup screen and doesn't lose the HDMI signal.
If you have tried all the above, then I am not sure what else to suggest, perhaps other forum members might have some further things that you could possibly try.