MacBook Pro internal keyboard disabled. How to re-enable?

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I bought a used 2.16 gHz core duo MBP that the previous owner said had keyboard problems ("a few keys don't work"). He explained, "A while back I paid to have an Apple technician take a look at it. He said that the keys were bad and suggested that he disable the keyboard entirely, but stated it could be re-enabled; I assume he somehow shut it off. No liquid was ever spilled on it."

Before I can try any suggested fixes, I need to figure out how to re-enable it.
Using an external USB keyboard, I tried the following:
sudo kextload /System/Library/Extensions/AppleUSBTopCase.kext/Contents/PlugIns/AppleUSBTCKeyb oard.kext/
This did not re-enable the keyboard.

If I can't manage to fix it, how do I disable it again?
BTW, the internal touchpad works fine.

Thanks for any help.
 
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Your Mac's Specs
Mac Mini Core i7 2012 | White 2009 MacBook 2 Ghz | 733 Mhz G4 Quicksilver
he's probably just disconnected the cable, go over to iFixit and look for your mac model, there will be a guide to remove the keyboard and see where the connector is
 
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I checked visually, and cable is plugged in. Also system information, under USB, indicates presence of internal keyboard.
 

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