Hi Ebon, you said, it is flashing? Or do you have a blamk screen?
This can happen, when the resolutionb of the monitor is out of sync. You can try to create an /etc/xorg.conf file, where you can set the resolution. Xorg.conf is not needed any more, as the monitor is telling the resolution and the driver discovers it. But you might get false results. Also you my try not to connect tu HDMI port, if your carrd oor your monitor has VGA or DVI, try these, too. My card has HDMI and DVI, and I am using a cable with HDMI on one side, the other has DVI. Prior I was running another monitor with the GT-960 with an adapter from DVI to VGA on the card side, and VGA on the monitor side. Ah, and one thing: There are different qualities within HDMI cables! I sometimes had to exchange HDMI cables by customers when they use it at sattelite receivers with HDMI output to the TV. Exchanging it and suddenly I got a picture! So, try some other HDMI cable, too. >From your mail I see nothing to be wrong in debian, so far everything looks fine. Oh, another hint: You can also try the tesla driver (it is something 470.xx.xxx), this one should also run perfectly. The 535 needs some special funtions, not all NVidia graphic chips got them. I used both, and there was no performance difference between the two versions. However, the 470.xx version is looking a little bit stabler, but this I can not prove. Just a feeling. Hope this helps! Best Hans