Re: Probem with connecting projector with laptop in vista...
You need to change your graphics card settings from extended desktop to cloned desktop. You will find that if you use your mouse currently to drag a window or icon across to the projected screen, it will move the window there. This is the extended desktop. I assume that what you want is to have the exact same screen on your laptop and your projector - this is called the clone screen. These setting can be by right clicking your desktop, select properties. Click on the display settings tab. click on the advanced settings button, and the the graphics card tab. There should be another button to launch the graphics card settings there.
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It could be the laptop settings. You have to clone the output of you video card. You might have extended desktop setting selected. See if your mouse shows up when you scroll it across the screen. (go all the way left or right) . If you have questions you can call me 1-646-441-5254 Hope this helps.
Connect the external display port on your laptop computer to the projection system, and then turn on the projector. For information about connecting external devices to your laptop, see the documentation for your laptop computer.
Set the display resolution of your laptop computer to match the resolution of the projector system. First, on your laptop, open the Display Properties dialog box by using the Display icon in Control Panel, and click the Settings tab. Then, in Screen resolution area, move the slider to adjust the display resolution of your laptop. If you don't know which setting to choose, try 800 x 600 pixels; this is a common setting for many projector systems.