I cant manually adjust the keyboard backlight with the F8, F9, F10 keys. When I press them normally, a grey box with the correct logo appears, but it's got a little circle with a cross through it. as if the option isnt available. when i press holding down Fn, my expose kicks in. my wife's MBP works perfectly, and I just copied (the best i could) all her system preferences for power settings, keyboard/mouse, etc. attached is a screen shot... I want to manually adjust my keyboard backlight as I want. (but dont want it to come on automatically in low light conditions, etc so i can save batt power if need be)... any ideas? the wife's machine is working just right... mine however!