@Irios:
@pkaira:
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However, I am having trouble setting it up as an headless unit. It works fine as long as a monitor is attached during startup (first 10-20 seconds), but if no monitor is attached than network doesn't come up. I have tried using display emulators but without any luck.
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I am experiencing something similar here on my DS67U. I doesn't seem to post (after initial power-on) if there is no display connected to the HDMI/DP ports. Any time I reboot (or restore power) on the system, it never gets past the post screen. If I connect a monitor after power on (usually to troubleshoot and see why pfSense hasn't started, sigh), the monitor will immediately go into standby - meaning there is no signal on the monitor output. It's very frustrating, because it means it's impossible to use the computer as in a headless config.
I currently use DS57U, DS67U and DS77U without issues. What is your boot media? Which BIOS and pfSense version? VGA/Serial Console?