Wii U shows black screen and gamepad is unable to connect.

When turning on my Wii U console, the screen has no output and is just black while the gamepad stays off (Unless I turn it on before the console where it powers on the console but displays a failed to connect error)

I have already tried to remove the CMOS battery with no luck - was suggested by a youtube video!

I have linked a video of the issue: HERE

Any help would be great :)