Mac boots but keyboard and track pad dead

Ok this may be a long shot, but any help is appreciated...
My sister dropped her Black MacBook. The screen is shot, however, it boots and I can use an external monitor.
The problem is that the keyboard and track pad are completely dead (except for the power button that works as it should). My question is: what are the possible problems? Could it be the topcase itself that is bad (or just the ribbon connecting it to the logic board)? Or could it be the logic board itself that is cracked?
I took the top case off (my first time doing this) and noticed that the little white connector at the end of the keyboard ribbon cable that plugs into the logic board can come off. Should that connector be able to come off?
Thanks again for any help!

ok the macbook works great with external monitor, keyboard and mouse ...i'm using it to post this message now...
anyone else seen this issue of the keyboard not working, or have other suggestions? I would just go and get a new top case off ebay but i dont want to spend the money on the top case is it's actually the logic board...
thanks again

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