Alright, I do computer repair work on the side. Well today a machine came in from another repair shop. They told me that the client spilled wine over the keyboard and it shorted out. They ordered a new keyboard and it still didn't work. The system board still turned on, passed POST, and loads windows. They figured something was wrong with the system board and ordered a new one and replaced it. Still same issue no keyboard. So they ordered 2 more keyboards (This time correct P/N's) and both keyboards don't work still.
Is it possible that by using one for a slightly different model it shorted out the K/B connection on the motherboard? And if so is there any way to test that theory? They are about to order another motherboard, but they brought me the machine instead to see if I can fix it or not. When I hook up an external keyboard the external one is fine but again the internal one is still a no go.