Just a heads up... we had issues with our Wii U Nintendo provided HDMI cable. It's been noted that their Wii U display on screen flashes randomly with Nintendo's cable. This happened to us. IT's VERY obnoxious as the screen will go to black and back to displaying the Wii U screen in 1-2 seconds... and it will repeat. Sometimes it wouldn't do that.
I ended up replacing the cable in a rage fit. We are playing Super Mario Maker and it kept doing that at least 30 times.