► Switch off the notebook and the external monitor.
► Connect the data cable of the external monitor to the monitor port of the notebook.
► First switch on the external monitor and then the notebook.
This is important as the signal is sent through the cable from the TV to the unit. The laptop then picks up the attached when you power on.
If when you power on both screens are blank - try flicking the screen using the FN + F10 key (Toggle output screen)