I have a sony vaio duo with a bad screen. I went into pc settings in win 8.1 and told the screen to only show the 2nd screen which is a 27 inch vga plug in screen. It asked me if I wanted to make it primary and I said yes. Now the bad sony touch screen is completely out of the picture. I tested the 27 inch screen on a restore of image and it came up fine - whew. So try declaring 2nd screen only and see if the pc asks you if you want to make it primary....Gene