744F panel problem

[Guest Nighthawk117A]

I have just installed the 400F on my system and when I try to do a flight, it loads up fine but after a minute or 2 all the sceens on the panel go blank and no matter what I do I cant get them to come up again. The FMC still works and all the switches etc seem to work fine. Anyone have any ideas?NH

[Chaos81 110]

Sounds like an activation problem. Try reinstalling and reactivating, if that doesn't work, contact PMDG support through email.