Ok around 2007 people were complaining that their caps lock key didn't light up but the caps lock still worked anyways. And you would have to go to the bluetooth icon and disconnect/reconnect the keyboard for the green led light to work again or reinstall the batteries. So its 2010 and apple have not fixed this bluetooth glitch YET. It also happens with my friends iMac So Apple really needs to address this issue because I've been waiting and waiting so darn long. All they need to do is release an update to fix the bugged driver. Sign below if you have this annoying issue.