The displays on all 737 aircraft not working (Primary and Secondary Engine Indications,Flight Instruments, CDU ect...)tried reinstalling still nothing. Has anyone encountred this and how can it be corrected.Thanks

You have an authentication problem. Check out the PMDG wiki or contact PMDG support.Also if you do a search you will find lots of information on this.

Ms/Mr Nameless,Please take a moment to read the forum guide lines. You need to sign your posts with your real name.Are you talking about 747 or 737? If 747 it is a validation issue just as George mentioned. If it is the 737 you might wanna check your start-up procedure. Also if you have both 737 and 747 have you installed them in the right order? See How do I install the 737NG alongside the 747-400.Hope it helps,