The top row of my keyboard (fron "esc" key to "eject" key) is not responding. I cannot adjust the brightness or the volume anymore. The only 2 keys on the top row working are the volume down key which enables expose instead of volume down and the volume up key which enables dashboard instead of volume up. The rest of the keyboard works fine. I have done an SMC and PRAM reset but to no avail. Any help would be greatly appreciated.