Displayport stops working when i install drivers

[Gav_881]

780TI SLI setup with a 4k HDMI display connected using a DP-HDMI converter. Bios works fine as does windows when i have no graphics driver installed. install the latest nvidia drivers and the screen goes blank.

HDMI output works fine but cannot push 60Hz to a 4K display so i'm trying to use the display port.

Any ideas?

 

[Gav_881]

Legacy boot was apparently blocking the displayport UEFI worked, HDMI worked with both

 

[harvey.l12]

Thats a strange one... never seen that before myself. Glad you sorted it.