Need help hooking up my second monitor

I have one monitor hooked up to the HDMI port on my laptop into the HDMI port on the monitor.
The other monitor is hooked up through a D-sub to the DVI port on the 3900. the monitor says no signal

Hi Brian,

Thanks for posting! I see you have also reached out to us directly via with one of our PlugDebug files ( and I have already sent a direct reply. Please just continue to respond to my direct response so we can keep all communication in one place.

Thank you,

Plugable Technologies