Usually when Cimatron will not start, and error message will be given. Licensing, Graphics, etc.
However there is one type of start-up problem caused by screen position of windows that gives no error at all. Cimatron simply tried to start and then stops. In such a case delete 2 files from the C:\program data\3D systems\Cimatron\14.0\Data folder
The system remakes these files on start-up, so there is no need to replace them.