Strange wired keyboard behaviour

A key failed on my original iMac usb keyboard and I have inherited another, also a full size usb apple aluminium keyboard.
When I first used it I noticed that all key function was fine except for shift-t, which gave no response at all. Small-t worked and all other capitals also worked. Caps Lock-t gave T as expected.
Software update asked for what I think was the Aluminum Keyboard Firmware Update 1.1 which I applied and all was fine, shft-t now gave T.
Today I am back to shift-t not registering, Caps-T, small t and all other shft keys are all fine. The only thing I have done recently is apply the lastest update for MS Office 20011.
Any ideas?
thanks
JW
iMac 24" mid 2007
10.7.4
Keyboard model A1243 US layout
Keyboard info from system profiler:
Product ID:
0x0220
Vendor ID:
0x05ac (Apple Inc.)
Version:
0.69

Checked this, nothing defined with as Shift t.
Zapped the PRAM (which is difficult as Lion want to go into recovery mode rather than zap the PRAM) and restarted.
Didn't make any difference
Connected a different keyboard to my iMac and Shift T works fine. Its also an A1243 but a slightly difefrent model (with the 'vertical' orientation of the Return key, rather than the horizontal of the keyboard that wont work properly).
Connected the keyboard to my Mac Book Pro and Shift T wont work, so I conclude that its the keyboard rather than the computer or a fault that is common to both instalations (both 10.7.4).
Oh yes, I just tried the thing back in my iMac and shift t now gives.... T
Long may this last.

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