Keyboard keys stopped working, no spill, possible issues?

The other night I was working on my MBP, and all of the sudden keys stopped working on the keyboard. I attached a USB keyboard and all keys worked just fine. This leads me to believe it is a hardware related issue and should be fixed by replacing the keyboard. Some keys work but most do not. I tried removing and cleaning the keyboard, yet to no avail, it still does not work. I have ordered a replacement keyboard, but am not certain it is a keyboard issue. What are the other possible diagnosis and how would I test them?

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Check in Applications->Utilities-> System Profiler (Information in later OS's) to see if the keyboard is detected, If it is you can figure the keys or their circuitry need repair (replacement it's very hard to repair keyboard circuits).

If the keyboard is not "detected" then it's a connector. ribbon cable, or logic board problem. If not detected I would check again after the new keyboard is installed… if its still not detected a close examination of the circuitry with a magnifying glass would be logical.

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Thanks for the response. I actually did what you suggested before posting. It was recognized and I did deduce it was the keyboard. I ordered a replacement And after I changed it out the problem was solved.

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Jody will be eternally grateful.
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