Over the holidays, my trusty HP m1170n desktop went down after 5+ years of service.  I bought a new HP p6210f to replace it which was a great step up at least I initially thought.  Already having a nice graphic card, I added my current Nvidia card to connect up my other two monitors but only two of the three monitors worked.  After consulting HP Support they noted that once you add another graphics card, the onboard disables!  They had no solution and I couldn't believe a PC a bought 5 years ago could run three monitors on two graphic cards, but a current model couldn't.  What a step backwards!

However, after nosing around on HP Support boards and Neowin, I was referred on to an HP USB Graphics Adapter that could resolve this issue!  Not great product knowledge on HP Support side, but shows you the power of community!  Now my local setup is back rocking!