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Cannot extend desktop onto second monitor all of the sudden

I have a Dell XPS 8300 on Windows 7 with a NVIDIA GeForce GT 545 graphic card. I also have two Dell St2420L monitors. This computer is almost always on and of course when not in use an screen saver ...
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1answer
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How to extend Dell Laptop Latitude E6410 screen to 2 external LCD monitors using a dock with 2 DVI ports?

I'm running Windows 7 enterprise. Two of my external LCD monitors are connected to my Latitude E6410 through the 2 DVI ports on the dock. However, I could only get 2 screens to display at the same ...