Dell laptop with docking station dual monitor problems

I have a Dell E6400, I have been using the laptop as a monitor along with an external monitor, plugged into a docking.

Now I just got a second monitor, so I want to dock the computer with it closed and use the two external monitors. I plugged one into the docking station, into the blue plug, and the other into the side of the laptop, also a blue plug. But the one plugged into the side of the laptop will not recognize, what am I doing wrong??
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More about dell laptop docking station dual monitor problems
  1. I don't think you are doing anything "wrong" here, but I doubt your video card will run 2 external monitors. You can check your manual to be sure.

    Try this device
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