ya I understand its NVidia but what brand ??
I been scratching my head on this and the manual is little help but it may seem that you got to go dvi [monitor] to dvi [[card] or d-sub [monitor to d-sub [card] ??
so the factory cables you got for the monitor one should have dvi-d on both ends ?? you may not be able to cross d-sub[vga] over to dvi-d ?
use this cable with the dvi - ''I'' at the card '' 15pin-to-15pin D-sub cable, Detachable ''
or the dvi to dvi ''DVI-D to DVI-D connector, Detachable'' [dvi-d will work in a dvi-I for digital signal only]
this looked interesting as well ??
''(Connected using the DVI cable)
If you still see an error message on the screen when the monitor is connected properly, check to see if the monitor status is set to analog.
Press '' button to have the monitor double-check the input signal source.''
https://www.overclockersonline.com/images/articles/samsung/275T/manual/troubleshooting.htm
one more thing to point out is this with 900 cards ?? I don't know
https://forums.geforce.com/default/topic/777114/geforce-900-series/gigabyte-gtx-970-phantom-monitor/
http://forum.giga-byte.co.uk/index.php?topic=15154.0
gigabyte cards seemed to get this more often is why I asked brand ?