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I have tried to use an external projector at work, which works alright with the same laptop on windows. As I am not very skilled in computers, so I am just kind of freaking out. could you give me some help?

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Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information. – Jorge Castro Sep 27 '11 at 17:53

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I experience those issues too. For me, bringing up the "Monitor Preferences" dialog seems to trigger a "scan" if a projector or external monitor is connected, and fixes the problem in most cases. Unfortunately this does not work for each and every case, but I could not find any better solution yet.

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