I am having the same issue and posted to the Intel board. One thing I can suggest that you try is to try and configure the video section with the CMOS of your Intel mobo. I too am using an external monitor. However, although everything except the internal display is working, my screen stays black with no indication of any signal. You mentioned that your display was a white screen ...
There was a white and grey pair of wires attached to the chassis that I have not connected to anything. Are they integral to the solution and if so where would they attach? Documentation was lousy with the chassis.
http://communities.intel.com/thread/28690thanks