Mac uses HDTV as an extension. Please drag window on desktop all the way towards right to cross display edge and the window will be displayed on HDTV. You may set HDTV to a mirror display 1 With your TV connected to Mac, open System Preference 2 Select Display 3 Select Arrangement tag 4 Check Mirror Display Transmitting audio to TV 1 Open System Preference 2 Select Sound 3 Select Output tag 4 Choose external HDMI instead of built-in speaker Specification Support Display 1.1a Support full 1080p HD digital video Support audio Support 36-bits of color depth with a 120 Hz video refresh rate Support Data transfer rates of up to 10.2 GB/second HDCP compliant Connector: gold plated male Mini DisplayPort/Thunderbolt amp; male DisplayPort Length : 1,8 Meter Compatibility Apple MacBook MacBook Pro Retina MacBook Pro MacBook Air iMac Mac Mini Mac Pro Lenovo ThinkPad X1 Carbon XT430sW530