[MBP 15"] Mini-DisplayPort to Eizo S2431

Hi all !
I've a MBP Unibody 15" with an adaptator MDP to VGA and a Eizo S2431 in native resolution 1920x1200.
When I connect my external screen (eizo) I can't have the native resolution, I can only have a 1680x1200 resolution...
Is it due to VGA cable ? If I buy a MDP to DVI, is it going to work ?
My screen work very well with my desktop linux in vga or dvi.
Thank you for your answers!

Is the MacBook Pro recognizing the TV at all?
If not, it's worth trying to reset to NVRAM and PRAM: http://www.macbook2tv.com/2012/04/resetting-pram-and-nvram.html
If the MacBook Pro is recognizing the display but nothing is showing, try different display resolutions (System Preferences->Displays).

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