Keyboard doesn’t work after fix

My Dell Vostro 5568

I replaced the palmrest-upper case, but the cable connector had broken when getting out the keyboards cable. 

I connected it back only with the strap but now the keyboard doesn’t work at all. (On Windows load)

What do I need to do in order to fix this problem without replacing keyboard because I know its ok, than to make it work again in my perfect laptop. 

Thanks in advance

p.s

The “add Product” above does not find my laptop when I write Vostro 5568!!!  dddm!!

And now the laptop closed and far.