are you trying to use the Eeprom clear on the DUE if so it will not take it the DUE has no onboard memory to clear like the mega
the display sketch has the clear memory for the DUE and every thing else coded right in to it and to make sure your plugging your usb cable in to the usb closest to the power plug on the board
the display sketch has the clear memory for the DUE and every thing else coded right in to it and to make sure your plugging your usb cable in to the usb closest to the power plug on the board