Install Linux and ~~ Audi ~~ sudo everything <| sep |> I think it recognizes that your trackpad has no connection to the logic board , and just like the iPhone 7 home button , it ' s trying to tell you to connect an external trackpad . This means that the sensor that controls the input devices is working , but somewhere between the board and the trackpad there ' s an issue . I say trackpad because the keyboard plugs into the trackpad , and the trackpad plugs into the board with a ribbon cable . If that ribbon cable failed this would happen , same as if the trackpad itself died . However , I ' ve never seen that graphic . I ' m paging uLARossmann , since he knows more about this than I do . However , if it wasn ' t a Retina I would tell you replace the ribbon and get back to us . Let ' s see if Louis has any advice .