Not accurately displaying
If there are missing lines in the display, the PID display will probably need to be replaced.
Not powering nor displaying
If the machine was just transported via a common carrier or in a vehicle, please check the connection behind the PID display. Sometimes, the computer cable will dislodge from the PID display or on the other side into the black control box. Here are some pictures to review and get those connections back. Please be careful not to misaligned or bend the small prongs as this will damage the PID display or black control box.