I don't know what else to suggest, i have heard there has been issues with the hdmi lead with certain TV's so maybe try another TV to see if the console works, or even another hdmi lead, (i have not used the Nintendo lead myself)
I hope you can get it sorted out soon.
When you get it all working, don't forget to visit here again, you will find lots of people who will help & advise you on the world of Wii U.
- tina p likes this