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I have got both an 27" iMac and a Samsung 40" TV in the same room for kids. They are only 10ft away from each other, and I'd like to get a mirror image of the iMac onto the TV.

I've seen this work in a computer shop but I'm unsure if it was a Samsung TV.

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What exactly have you tried? Your question doesn't really contain any useful information. Are you using a displayport --> HDMI adapter (if not, then what)? Does the Mac detect that another display has been connected? – Jason Jul 9 '12 at 19:39
If you're unsure of the type of your ports and connectors, post photos so others can help you. – Global nomad Jul 9 '12 at 20:07
based on an offline comment from Geoff - he is using a HDMI adapter, audio works, video works but the resolution is wonky. So I think the real issue is "how can he adjust the resolution on an external display" – Jason Jul 9 '12 at 21:17
The resolutions won't be the same, so wouldn't one of the displays have to run at a lower resolution resulting in the poorer quality? If you use it as a second display, you'd be able to set the native resolution for each display and drag the applications you want to use onto the relevant one. – AlanJC Jul 9 '12 at 22:22

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