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Question: Resolution Configuration

I bought one of these and the screen will only operate full screen properly at a resolution of 1024*768. If I set it for 1366*768 part of the screen disappears off the end of the screen and the picture moves from side to side if you push the mouse to either side of the screen. In either setting the picture is out of proportion. Is it the monitor or my graphics card causing this? How do I fix it?