Have you tried changing the video output (VGA instead of DVI or HDMI, or vice versa)?
Other that that I’m out of ideas at the moment. See man nv, and try to experiment with the driver’s settings.
The computer is quite old and has only a VGA port,nothing else.
I’m currently upgrading NomadBSD after installing it again,as I removed it to test other OSes.
FreeBSDs servers are really painfully slow today 
I’ll try out some nv settings as soon as updates are finally completed.
Could you please post your /var/log/Xorg.0.log? It might give some hints.
Sure,it’s here: GGC-Paste
I fixed it!
It needs a custom Modeline to work correctly.
Here is my 00-video-initgfx.conf:
Section "Device"
Identifier "Card0"
Driver "nv"
BusID "PCI:0:13:0"
EndSection
Section "Monitor"
Identifier "default"
Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
Option "PreferredMode" "1920x1080_60.00"
EndSection
Section "Screen"
Identifier "Screen0"
Monitor "default"
DefaultDepth 24
SubSection "Display"
Modes "1920x1080_60.00"
EndSubSection
EndSection
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Excellent 