[CentOS] CentOS 7, new video card in server

Hi, folks,

   I've got a new Dell R730 server. My users have two Tesla K-80's in it.
Then, they wanted to add video, for complicated reasons.

   Anyway, there's the onboard VGA; I just put in a Quadro K600 (they
require DP, and this card offers that). Plug in a VGA monirot (the card
even comes with two adaptors, one from large DP to DVI-D, and one DVI-D to
VGA. (And according to the quick start guide, there's no additional power
cable.)

   Boot the system, and no video on from the card. In the BIOS, the only
thing I see that appears to relate is enable/disable onboard video. I'm
looking at that as a last option, since I have no idea how I'd *undo* it,
if I then have zero video....

   Dell, of course, doesn't support ordinary video cards in a server....
So, anyone have clues, or pointers, to getting video coming out of the new
card? Now, I have no issues with putting the proprietary NVidia driver on,
but I'm trying to figure out if I'm missing something.

   Note that, as a server, of course, it is coming up in runlevel 3.

       mark