she turned it "double negative"? so, it's normal? you need to be a little more descriptive, because if she just changed the colors to look like a negative, control+option+command+8 does work.
when people say ALT they mean OPTION, it's the same key in case you didn't know.
it should be in the lower right corner of your keyboard.
but again, as said before....
control + alt/option + command + 8
cool fact: because it takes so much energy to power the screen of you computer, when you use the inverted thing it uses less battery (if you have a laptop) because its darker and takes less energy to light the screen
Not that i really care that much, but this could easily be googled in a few seconds. I mean, wasn't it less convenient to make a thread on ns and then wait for a response?