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You need to send your laptop signal to your projector by pressing the FN key and the key that says CRT/or an icon of a screen (this is located at the top of your keyboard). 3l toggles will give you different images. i.e. projector image only, projector image and laptop image or just the laptop and not projector image.
hi try using the function key to toggle the display output form the laptop.every laptop when connected to an external display like projector works in the multiple diplay mode.in this mode the laptop vga output can be seen in 3 modes------ only laptop screen, only external deipaly(projector) & both laptop & projector.check this & this should work fine
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Don't forget to select the Fn key and F4 on HP laptops. It could also be the Fn key and F8 depending on the laptop brand. It is the apple key and the F7 key on a Mac notebook. On Laptops this will toggle the video to the aux port where the monitor cable connects to the projector. There are 3 modes. video on the laptop screen, video on the laptop and projector, or video to the projector only.
I'm going to guess that you have a wide screen Dell laptop with a 16:10 aspect ratio and a default resolution of 1280X800. The wide screen is great BUT most presentation grade projectors do not have a native (pixel for pixel) 16:10 mode. Instead they still prefer a display input with a 4:3 aspect ratio like your old square CRT or standard definition TV. Why do they prefer a 4:3 input? Mainly because Powerpoint prefers to display a slideshow in a 4:3 mode. Because of this Dell, in their infinite wisdom, created the 'presentation mode' utility in an attempt to automatically convert the VGA output of your laptop from 16:10 to 4:3 on the fly. In my experience this is an annoyance at best and at worst can seriously impact the size and quality of the projected image.
The best thing you can do when you connect to a projector is ignore the presentation mode alert and manually set your laptop's resolution to 1024X768 for an XGA rated projector or 800X600 for an SVGA rated projector. This will cause your desktop to look stretched on your laptop but will give you by far the best projection image.