New 27" iMac won't display above 1280 x 720

I just got my new 27" iMac but the max display size is 1280 x 720.
I went for the higher-end NVIDIA GeForce GTX 780M. On first startup the screen is full of static and then is drops into the 1280 x 720. I tried zapping the PRAM but the same static problem happens.
I'm trying to get in touch with support but the support page is giving me error messages.

I restarted my system this morning, and the correct display rersolution is currently working.  No update was installed this morning.  I had the system up and running overnight setting up iTunes Match.  Can't explain it, but we are fully up and running now.  I am going to do some more testing with it and send an email to my support rep with this screen shot.  WOOT.  Display finally looks as amazing as I was promised.  Also did a Graphics Benchmark last night, and got results:
FPS:
100.8
Score:
2539
Min FPS:
45.3
Max FPS:
198.2
Which blew my 2 windows desktop machines with NVIDIA Desktop Graphics cards out of the water.  Now I can play with photos!

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