The LCD module is very fragile and many units have been delivered with the LCD damaged during shipping. Check this page for photos and suggestions. The newest D7 units are now shipping with an acrylic backing plate on the LCD to help protect it.
- If the LCD shows a white circle when the UV is turned on (issue gcode M106 with terminal or use NanoDLP to turn on the UV Lamp) then it could have been damaged by pressure on that spot.
- If the LCD is showing half an image longways then the LCD cables could be loose. Carefully check them with instructions from this page.
- Check that the orientation of the secondary screen on the PC (if using) is set to Landscape.