Thanks for you suggestion. That is what I have been doing but did give it another try. Unfortuantely when I turned the computer back on it reverted back to the laptop screen. It is not the biggest computer problem in the world to have to select the external monitor on each restart but it does seem to me there should be a way of keeeping it set that way until I need to take the laptop on a trip. I would be really grateful for any further suggestions. Thanks.