Windows 10 Home 64
Nvidia GeForce GTX 960 v373.06, two monitor ports; one DVI-I and one DVI-D (both dual links).
2 x Benq GW2320 LCD monitors connected with DVI-D cables, monitor 1 running 1920x1080 @ 60Hz
Dual monitors were working fine on this set up. Moved box to different location where I used single HDMI monitor for a day. Came back, and now only whichever monitor is plugged in to the DVI-I port is working.
When I plug either of the monitors into the DVI-D port, that monitor screen does change from ‘No cable connected’ to ‘no signal’ but nothing more before going to sleep.
Have rolled back drivers, reinstalled to latest version. I looked in BIOS but saw nothing obvious. I’ve tried Windows Project, Control Panel → Display, which has no acknowledgement of the 2nd monitor. Have tried 'Rigorous Display Detection' and 'Force television detection' from the Nvidia control panel, none of which can detect the display.
Any ideas? Or further tests to rule out things?
edit: have tried reseating graphics card edit: screen attached via HDMI not receiving signal either