On my samsung sync master 793MB the image is in a baralled shape and the corners does not match the physical corners. When I used the Magictune program the pinbalance options for the 4 corners says unavialable when I clicked on them. Now the image is all round and distorted. The pincushion only adjusts the sides and not the corners. Now this monitor isn't working correctly. Samsung tech support said that it's because of my nvidia drivers that has this function already and automatically disable that of magic tune. But I don't know where the buttons are located.