Very strange USB keyboard problem

I am using the latest style USB extended keyboard, with my iMac G5
The "5" key and control key have gone wrong. I just get a beep when either is pressed. I note in Keyboard Viewer that pressing either the control key OR the five key shows that BOTH the 5 key and control key appear to be pressed. It is like the 5 and control keys have been locked together. To be clear, pressing just the five key = cntrl5
The 5 key on the number keypad works fine.
I have reset PRAM
repaired permissions.
set Keyboard Shortcuts in sysprefs->keyboard/mouse to default.
Confirmed that nothing is activated in Universal Access
I have tried the keyboard with another imac I have and the problem remains.
I have tried a different keyboard with the iMac G5 and all works fine.
I can only conclude the issue is with the keyboard and not with the set-up of the computer, OS etc. but I struggle to understand how this issue could be mechanical.
Does the keyboard have any sort of firmware that could be corrupted?
Note that the keyboard has suffered no abuse or mishap. The problem just "appeared" a few days ago.
Suggestions/ideas to fix?
TIA
edit:
I have just noted...
Pressing the left control key produces control-5 key stroke in Keyboard viewer as described above, but...
Pressing the RIGHT control key results in control-f5 key stroke.
So it seems the 5 key and left control key are locked together, and, f5 key and right control key are locked together.
weird!

Thomas,
I would concur with all the answers that the keyboard itself is the problem.
Here's a pic I took of the traces on a Pro keyboard:
http://s291.photobucket.com/albums/ll306/spudnuty/?action=view&current=Keyboardt races.jpg
Those lines are conductive. Where they run parallel to each other they are very susceptible to shorting. However most often they open up due to fluids dropped on the keyboards. Just the tiniest drop on a trace will lead to a fault, especially if it's tea or coffee.
Richard

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