One of my PFD's is not working someone help!?!

Hello all, just got PMDG 737, tested a flight out (sort of still getting used to it from Airbus X)

And I've noticed that when I start up the battery and start my checklist (by myself I need fs2crew lol), 4 PFD's pop up, excluding one, the one screen not showing up is the one in between the FMCs. Which is really weird, so I'm guessing it's either an install problem or something with the jet, (however I doubt it because I used these combos yesterday Ctrl+E and it showed up fine and working afterward..... So I'm guessing I'm either doing something very wrong, or the system is just not making it show up for some odd reason. And sorry if this was already posted before, I couldn't find it anywhere on the fourms (all 900 pages that is) Thanks for the help...  :mellow: I'm new to this.