Alienware repair guestimate?

Best place for unique parts.  My laptop was working until i replaced the keyboard.  Hope major damage was not done?  2016 - 17 R4.  After board replace, on button lit up for 1/2 second, then button sort of "sparked" then all went black.  Cheap quess cheap hope is to replace the button unit?  But a more dificult problem I am having is finding a little ribbon cable "lock" or what ever it is called.  Any enlightenment would be greatly appriciated.

Thanks, Maka