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#11
Very possibly, all the times I've seen 2 monitors used the addition of an Add-in Graphics card has disabled the built-in/onboard adapter so the VGA or DVI port or both on those computers having both ports. Using HDMI seems to be a lot of trouble according to posts on forums.I gather from the above that its the lack of an add-in graphics card that more likely hampered the dual display, rather than the secondary monitor I tried to use.
There are VGA splitters [maybe even DVD] to use 2 monitors but those show exactly the same information, I use them yearly when volunteering with a Health Fair group, lets me do data entry on a Notebook and the client view an external monitor to follow the progress of the work. On Notebooks the original use I had seen was for seminars where the presenter could watch the participants and a larger screen showed the subject matter behind him/her or in churches where projectors were used for the sanctuary.