1920x1080 not working on PC

  SilkCurtains 12:39 25 May 2017
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I have an lg smart tv as a monitor for my new PC. The resolution is 1920x1080. Out of the blue my pc starting running on 1080x720 so I changed it back on the display settings to 1920x1080. Suddenly I realised loads of my games were running on 1080x720 so changed them. After restarting my pc everything went back to 1080x720 and now I cannot even select 1920x1080 as an option. Someone please help!

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