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I successfully plugged in the projector in to my Acer 8930G computer, but when I'm tryng to show the slide show (like in Image Viewer or LibreOffice Impress), it begins in my laptop, though I'd like to start it in the projector screen. How can I show a slide show on the external display?

At my school, where Windows and MS Office are used, there's also problems like this.

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Follow the answer here and you should be all set:… – rosch Nov 10 '12 at 11:13

I usually set my displays to mirror mode. Start displays from Unity, it should show you both displays, and click on the "mirror displays":

enter image description here

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I tried that too, but it was not able to enable. – Aleksi Kinnunen Nov 11 '12 at 19:08

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