It should be lighted if you have the Caps Lock(Green) Num Lock (Green) Wifi (Green) or Bluetooth(Blue) on. mine always has the wifi and bluetooth on. if the caps lock symbol is not lighting up when you hit the key, there is something wrong with your bar system. I would call dell and tell them.
On the dell inspiron 6000, right above the F4, F5, F6 keys is a little bar that has info on if the Caps key, Num Lock key, scroll lock, WiFi, and there is one that is on the far right. What is this and how do you light it up? Should it be on or off?