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Configuration: Win-XP, SP3, Dell 2650 laptop, external monitor Dell 1081FP.

Objective- switch from laptop display to larger external Dell 1081FP monitor.

After connecting external monitor and using control panel/display/settings/ select monitor 2, and ensuring that the box " extend my windows desk top on to this monitor IS NOT CHECKED...then clicking on Apply and OK. Next using Fn key and F8 (switch crt/lcd) the desktop swiches to the external monitor ok. However when switching back to the lcd using Fn key and F8, the desktop does move back to the laptop lcd display but the extenal monitor automatically becomes the extension of the desktop. Using Fn key and F8 again to switch back again has no effect...nothing happens...the desktop remains on the lcd and the extended desktop stays on the external monitor. Tried may things to resolve the problem including updating the driver for the external Dell 1081FP etc.

Tried the external monitor Dell 1081FP on another dell ls400 laptop and everything works as expected.
 

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Check the settings with both notebooks to see what the difference is, you have used two notebooks and two different monitors, so if it worked on one and not the other there must be different settings going on.

Have not got my two monitor set up going at the moment, so can not tell you what settings, can not remember what I did but checking the difference in settings should help.

Beanie
 
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