F9 darkens screen

[MR ZenWiz]

On Mon, Dec 6, 2010 at 4:54 PM, Glenn Holmer <shadowm at lyonlabs.org> wrote:
> I have an unusual issue: lately, when I press F9, instead of whatever
> that should mean in the focused window, the entire screen darkens.
> Doesn't turn black, just darkens somewhat. Just did it and I can still
> type into this window. I don't see anything in my keyboard shortcuts
> that would cause it. Anybody else ever seen this?
>
Not enough detail for a good answer, but....

Do you have a function shift key on your keyboard that changes the way
the F# keys work?  Is that function key in the right state when you do
this?

Does pressing F9 again, or another F# key, reverse this?

Some laptops (you didn't say) have a key that dims the screen just
like unplugging the power cord does so the screen will use less power
when in battery mode.

Most of the answers you'll get with this little detail is, "Doesn't do
that when I try it," (which, BTW, it doesn't), and we have no clue
what your computer/keyboard/monitor are, so help us help you, okay?