External monitor works only works when laptop screen displays

Hi there, I just connected a different (newer, but not brand new) external monitor to my T61.  When I toggle screens (fn-f7) the external display gets no signal in the 'external display only' position, but displays beautifully in the 'both' position.  This never happened with my old monitor.  I would like to use the external display and not have the laptop screen display.  Any ideas? Many thanks, Ellen

H
Try this:
After connecting external monitor, press win key+p and thrn choose projector only.
Have a nice day
Ishaan Ideapad Y560(i3 330m), Hp Elitebook 8460p!(i5-2520M) Hp Pavilion n208tx(i5-4200u)
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