If an Application Error appears on startup verify the purple USB cable is connected to the Carriage Controller (located on the carriage, print head controllers plug into this) and the USB-ETH-CAN- Switch Board (located next to the waste tank). Check to make sure all the boards have power and all cables are plugged in. If there is a cable not plugged in, turn of the machine before reconnecting the cable. If all cables are confirmed to be connected, contact technical support.