The screen is grey because the wrong files on the SD card are being used to execute the user interface.
Delete ‘Recovery Config’ from SD card
- Remove the SD card from the back of the display.
- Insert SD card into your computer.
- Open the ‘Butler’ folder on the SD card, Then open the ‘Layout’ folder.
- Delete the ‘Recovery Config’ file.
- Re-insert the SD card into the display.