By the way. Just so you guys know, my wii u has seemed to recieve damage from what i believe was the usb hdd(the toshiba that nintendo recommended). My WiiU was acting weird.Choppy graphics and such. Then i read about Y cables and then suspected the hdd being the issue, then low and behold, i unplug the hdd, and things look better, with the exeption of a new ``ghosting``effect.I wasnt useing a y cable, over a long period of time, and now my wii u displays``ghosting``.  It ghosts with out the usb hdd pluged in.Feels like the hdd damaged it. i hope this is informative. and thank you for shedding more light on this issue. Also, there is a dark flickering that occurs on white screens, that which seems to be on rythm with the sound of the active machine(fan)