Hey all..I'm having a problem with my PMDG 747. I've tried looking up a solution online and have come up empty handed. The problem is, i start up everything on the overhead panel but my PFD or any screens for that matter wont come on! I've tried adjusting the brightness, I've looked for an avionics switch I may have missed, I cant find anything..Here are screenshots of my overhead before, and after...maybe I'm doing something wrong, or maybe it's a file problem? Sometimes, they will show up when I fist load the simulation, but then when I open a panel or switch views they go off. Anyone else having this problem?
Before startup:

After startup:
