It's a macmini running Mavericks, with a USB keyboard attached. The BT keyboard is a little Logitech. Disabling the capslock key in system prefs works on the the USB kb, but has no effect of the BT. I did a little Googling around and found there is a free app called Seil that will allow disabling the caps lock key on BT keyboards. The key must be disabled in system prefs first, and Seil must be running. It turns caps lock into a delete key. If it is desired that the delete key do nothing, Seil allows the key code to be changed to 110, which is PC specific and does nothing on a Mac.