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Is there something on my computer I need to check?
Please get back with the exact model # of your computer to have the exact steps about connecting TN to the computer using HDMI cable. Locate the model # here: http://esupport.sony.com/US/p/support-info.pl?info_id=264
However, try pressing the Fn + F7 or Windows +P keys to toggle between the display after establishing the connection.