Hi can anyone help me. I have the pmdg 747 x and when I start the sim with the engine on the primary flight display is on just for few second and than the display goes black.when i start the sim in cold and dark the primary flight display don't turned on even with the battery and apu on. any suggestion how to turned the primary flight display on?thanks

Dark displays are a symptom of a problem with license verification. Send an email to PMDG support for assist.Also, this forum asks that everyone sign with their name.