[CentOS] Trouble installing with Nvidia card

Hi all, I'm having trouble doing a fresh install of CentOS 7.3. I'm using the DVD installer ISO, burned to a USB flash drive. The system is a Supermicro 7048 with four Nvidia Titan Xp GPUs, and I have the monitor connected to the first GPU. In the BIOS, VGA priority is set to Offboard, so I am seeing POST messages (good).

The CentOS installer begins and shows a few messages on my monitor, but it stops after "Reached target Basic System" ok. At this point, if I connect a second monitor to the motherboard VGA port, then I see the installer continuing on that screen. Is there some way to install without using a VGA monitor?

Thanks in advance.