This morning when i turned on my Mac, i noticed that the F5 and F6 key was not working (higher and lower brightness of keyboard) so i went to System Preferences>Keyboard&Mouse and i clicked 'Restore Default' thinking this would restore the old settings of F5 and F6. I then noticed i had accidentally changed all old keyboard shortcuts from F1 to F12, can anybody help me? I wanna find out how to change my keyboard settings back to F8 for 'Play/Pause' F11 for volume decrease, F12 for volume increase etc.