From my (limited) experience it appears something is going on somewhere (BIOS or system bus level) to stop video output on installed cards, while letting them install perfectly in every other way. Why Linux is able to see the cards 'normally' I am not sure. Although I appreciate that I am attempting to use they system in a way (it transpires) other than the way Dell envisaged, I am surprised that it is so hard to get an external graphics card to work for display, something I definitely did not envisage as being a problem when I ordered the system (which included a CUDA card).
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