I bought a new 50 NU7100 last summer. Tv worked fine when Inwent to bed last night and today it shows no signal on HDMI 1&3 and on HDMI 2 it shows a blue screen. I have swapped out cables and cable boxes and nothing has worked. I literally bought this almost 14 months ago to the day.
Have you tried unplugging the unit for 5 minutes? Have you tried unplugging the HDMI devices and plugging them back in? Is the television connected to a surge protector?