Nintendo Wii U Black Screen

Take the disk out of the console. Turn the console off. Wait 30 seconds and then turn it back on.

From the Wii U Menu, select "System Settings." Using the Left Stick, scroll to the "System Update." icon and press the A Button. Tap "Update" to connect to the Internet and begin the update process.

Unplug it and plug it back in. If it looks like it has been damaged, replace it.

Tap on the Settings button of the gamepad to open the System Settings. Go to the TV menu. Press A to validate. Select on the TV resolution men. Change the resolution to either 480p, 480i, or 1080p