HT202079: About Mini DisplayPort to HDMI adapters
Learn about About Mini DisplayPort to HDMI adapters
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Helpful answers
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Apr 24, 2012 10:46 PM in response to WhiteheadTrevby X423424X,Open your Displays system preferences and look at your Arrangement. That specifies the spatial relationship of the two "monitors". Arrange as desired by sliding the two "screens" around.
Is your main monitor still your MBP? That would be the one with the little white menu in the Arrangement picture.
Are the resolutions correct? Refresh rates (if they are present)?
Can you drag the mouse from one screen to the other?
I think you are misinterpreting what you are seeing. If screen saver was active just moving the mouse would deactivate it. There are many screen savers which only draw to one screen. But they would still turn off when you do anything with the machine like moving the mouse as I said.