ok so yesterday while i was watching a dvd on my MB i could use the F3 and F4 buttons to adjust the volume. Today with the same dvd those buttons mysteriously won't respond to any commands. However, I can adjust volume with the remote but that is not the point of my frustration. I don't recall making any settings to not have those buttons function. Anybody else run into this type of prob before?? Also the F1 and F2 keys won't respond to setting the monitor brightness either. Thanks!!