Hi everyone...
With my MacBook (13-inch, Core 2 Duo, 10.4.11), pressing the 'W' key on an external USB keyboard has the same effect as pressing the “increase screen brightness” key on the built-in keyboard. (And it types a 'W' too.)
I've used this keyboard for many months, if not years, with no problems.
Can anyone help me?
(Lately I've observed several of these bizarre little glitches, like restarting upon closing of the display, and the omission of one letter from my name in the “You must authenticate to unlock the screen” box, which resolved itself after I restarted the computer. I thought this kind of stuff was something I left behind when I switched from Windows?

)