Bootcamp and iMac Thin USB keyboard issue....

I work at a university where we have several labs that are setup with iMac's that have been made dual boot for obvious reasons. Everything has worked without a hitch, until the upgrade from Leopard/Vista to Snow Leopard/Win7. Since upgrading, most of the computers still work, however we are having issues right now where the Mac keyboard will not respond until the computer is up and running. We can no longer do ANY key commands prior to loading into the bootcamp OS Picker. Beyond that, whenever we try to run Win7 on a handful of machines, the computer goes to a black screen asking which OS we would like to run with only showing the valid Win7 option. Normally choosing this option would cause Windows to load, however, the Mac keyboard still remains unresponsive. If we plug in ANY other branded keyboard, this screen doesn't appear, and Win7 loads just fine.
Upon getting into Windows/Snow Leopard, the keyboard works just fine.
Does anyone have any ideas as to what could be causing this? Is it a setting that we have missed somewhere along the lines? Has someone or something possibly altered the way EFI responds to the keyboard?? What could be happening? It is very puzzling that ANY other branded keyboard has no problem, but any of the Mac Thin USB keyboards we try all have the same results....

After some more testing, it appears to be an issue with the bigger aluminum USB keyboards with the number-pad on them. We have replaced the keyboard with one of the small aluminum ones (sans number-pad), and we now have all the EFI key commands working again. We have also tried a Dell and a Gateway keyboard, and these all work as well, we can even get these to trigger a Net-boot.
Apparently there is something that is drastically different with the "Large Aluminum Keyboard with Numeric Keypad" that is causing it to not work as intended. Everything was fine UNTIL we boot-camp was installed and now this specific "style" of keyboard is not working. We have tried 3 different keyboards of this style, and they all yield the same results of nothing.
Now poses the question what do we do, as EVERY Mac that we own has the "Large Aluminum Keyboard with Numeric Keypad". At this point, it seems like my only other option is to contact Apple Care and see what could be causing the problem....

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