graphics card dying

Jan 12, 2018
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I recently had a tv I was using as a monitor break on me. its native resolutions was 1920x1080. Since then I tried hooking up another tv with a native resolutions of 1368x768. whenever I select 1368x768 my screen starts showing a polarizing picture. since then i have been using 1920x1080 since its not the native resoulution it looks pixlated. I wanted to know if anyone can help me out and tell me if its my graphics card thats broken or if my computer just doesnt like that setting, And I have noticed a small performance drop in games but nothing too major.