Three Monitors Issue

I have a user using three monitors, Dell laptop e7450, with docking station that supports three monitors.  The middle monitor, is positioned vertically.  The two others, are set horizontally.  The middle vertical monitor, does not cover the whole screen.  Any ideas if that can be fixed and how to do it?  thanks in advance.  BTW, using Windows 7, 64bit.  Dell monitors 22".
Solo PascualIT SupportAsked:
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what are the inputs from the monitors to docking station? VGA, HDMI etc
Make sure the resolution set for each display is correct. If necessary you'll also have to dell the system that your middle display has a resolution of 1080x1920 rather than 1920x1080 which would be for when it is horizontal. Besides that you must also make sure your video card supports the maximum resolution of all 3 displays. Many cards are limited in that respect so you would have to use lower resolution displays.
I had a similar issue the other day, and I needed to update the driver for the machine.  Once I updated it, it worked fine.

Otherwise, i  would agree with rindi and make sure that port supports the resolution.

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