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Helpful answers
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Dec 6, 2015 4:40 AM in response to MsAnneThropeby Rudegar,the fact that the tv is a "smart" tv is irrelevant, when it has a hdmi port it's just a mother display for the computers point of view
and from the tv's point of view it's just connected to an input source like a DVD Player or sat box
if the iMac has a resolution the tv does not support that could be the problem I would go into system preferences and display and click gather windows and set it to extend rather then mirror and adjust the resolution of the tv
or for troubleshooting trying another tv
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Dec 6, 2015 8:21 AM in response to MsAnneThropeby Duane,If you get an Apple TV and your Mac is compatible, you can use AirPlay to send you Mac's screen to your TV. See Use AirPlay to display video from your Mac on an HDTV - Apple Support