My O, L, and '.' keys are not working!

I have a question. I have a PowerBook G4, 1.5 GHz, Aluminum. Recently, my "o", "l", and "." keys are working intermittently. Half the time, they do not work. This is not a software problem as I have an external keyboard. Does anybody know what's going on??? I don't.

Sounds like a cracked trace on the keyboard PWB.  Best to just replace the keyboard.  You might get more information at this link:
http://www.powerbookmedic.com/Powerbook-Keyboard---G4-Aluminum-p-16506.html
Replacement can be a bit involved:
http://www.ifixit.com/Guide/Installing-PowerBook-G4-Aluminum-15-Inch-1-1-5-GHz-K eyboard/223/1
In this case, the Titanium models have the Aluminum models beat, as replacing a Titanium keyboard is a 2-3 minute process, tops.

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