Keyboard problem unsolvable, or just challenging ?

As I seem to have run out of help on the previous thread I will restate the problem and the steps I have taken to troubleshoot it:
Problem:
I have the Apple Keyboard which came with my 1st generation Intel iMac. It has a numeric keypad, but no num-lock key. The "." key and the number keys do not make input to any of my applications. The =, /, *, -, and + keys on the numeric keypad work as they should.
Steps I've taken:
1) Pressing those keys with Keyboard Viewer open indicates the keys are connected to the system.
2) Repaired permissions from Safe Boot
3) Repaired disk from OS startup disk
4) Changed USB ports
5) Re-started computer (many times)
6) Tried another keyboard (a brand new one)
Inasmuch as steps 2 through 6 did not result in my being able to use the keys in question, it is reasonable to assume that there is some, as yet undiagnosed, software problem.
Is there anyone out there who has a new idea for me to try ?

If you provided the latest OS X upgrade Snow Leopard 10.6.x a completely erased, or
zero-overwritten, partition mapped GUID, and formatted HFS+ free space for an all
new complete install, without any chance of the former system problems or any odd
user account glitches from your former content, a new system should have been a
good test-bed to further diagnose any (hardware?) agent; if glitches survived the event.
To upgrade over a problematic computer configuration appears to have only added
a new level of mystery to the mixture of previous system problems in the early Intel
based Core Duo computer. Not sure, but at one point some Core Duo (not C2D)
models owners had issue when upgraded past Leopard 10.5.8. There may have
been some Firmware update offered, but I have not followed their development.
You should have a complete pre-upgrade bootable clone of the iMac's Tiger system;
to revert to or at least to use for file recovery purposes or migration purposes; then
you could totally erase the computer's hard disk drive and have Disk Utility write
zeros over the expanse of its capacity; so if there is a chance of corruption issues,
you can mitigate them or at least try. Before upgrading to a system so far advanced.
A clone backup gives you an ability to actually revert to a former state, via re-clone.
There have been some instances of user experience where Leopard 10.5.8 worked
well in a class of Intel-based Mac computer, but Snow Leopard did not do as well.
So, you may need to do a thorough effort to restore a working system from scratch.
Good luck & happy computing!

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