Someone came to my shop this morning and said that the system is working but is not display on the screen, I checked the system about what my customer told and I discovered that my customer is right, the solution of the problem is that connection of the screen is not connect to the system, so I have to connect it back properly and the system start working and display on the screen but sometimes module can cause it, and if the modules that has the problem we need to change the module and replace it with another one.