i've had the new SR MBP since July and everything has been working fine on it. but yesterday, out of the blue, the backlight keyboard quit working and i cant seem to figure out how to get it running again. everytime i push the bright or dim buttons (F9 or F10), it shows the icon on my screen but it has a circle w/ a slash through it. also, i have the backlight function turned on under the keyboard and mouse section in system preferences. can anyone help me figure out how to get this working again?????