I can`t find a solution to this, i just did a clean install leopard today and now my macbook pro display does not go to sleep mode when i output it to external monitor. I do not encounter this problem previously in tiger OS. The following steps below is what i do normally to get my macbook display to sleep... 1. close the lid, macbook go to sleep 2. wake up using external keyboard 3. now the external display is active while macbook display remain in sleep mode i could not achieve the third step now, anyone facing the same problem ??? it is very distracting to have an extra display next to my monitor.