I recently noticed that the F6 key on my keyboard was not working. 
What is perplexing, is that I have tried both a conventional and a USB
keyboard, resetting, cleaning out the key, etc, and it still will not
work.  With Logitech's game profiler that comes with all of their
joysticks you can map macro's to various keys.  Normally if you press
a button it shows a press/release combination, but for my F6 key it
only shows a release, and doesn't register the press.  Given the fact
that this is affecting multiple keyboards of multiple types, I believe
this must be a software problem.

Check that F6 hasn?t been allocated to a shortcut within any other
program -- especially Word. Allocations can be global.

Best

If this is a problem I would get somebody to check that out or buy a
new keyboard for $10-$20.

Guzzi-ga,  It looks like that isn't the problem either.  I've never
setup a shortcut in word/excel, but I double-checked anyways with no
result.

Jimmy - I've tried it with several keyboards, its not the physical
peice of hardware, its something OS or software related.