When i plugged a projector into my iMac the resolution changed on my desktop

I'm a relativly new user to mac. When i plugged a projector in through an adapter via HDMI the resolution changed on my iMac & I am unable to set it back to the way it was. Am i missing something?

Sorry to say but no hope.
With an external display/projector connected to the iMacs there are two ways to layout the two displays:
- Mirror Mode: where both display show the exact same content and where the display with the lowest resolution sets the resolution for both displays.
It's not possible to use different resolutions on both display with this mode.
- Extended Mode: where the second display is an extension to the first one and both can use their highest resolution.
Stefan

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When you connect your iPad or iPod to the Mac, click on the device name in iTunes - don't click on the arrow on the device. Then click on the Music tab in the main window pane. Now you should see 'Sync Music' and all your playlists, artists and albums. Here you mark the checkboxes for what should be synced.

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On the phone, under Settings > iCloud you can select to turn iCloud ON or OFF.
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http://osxdaily.com/2010/05/06/stop-itunes-from-automatically-opening-when-iphon eipod-is-connected/
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When I insert my logo into a title, the colour changes. How do I stop this happening?

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Hello I shut my iMac down to move it to the next room when I plug it back into the wall, hit the power button nothing happens. I tried holding the power button nothing when't back to the first room plug it in where it was 2 mins ago nothing?

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When i plugged a projector into my iMac the resolution changed on my desktop

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