3 Monitors and Valve Index on 1080Ti

[kration]

I'm a bit confused. I've raided my plentiful supply of monitor cables/adaptors but none work.

I've got a 3 x Monitor display (Dell U2414H) which ran fine with my HTC Vive from a 1080Ti Aorus.

I've got a Valve Index which runs off a different connector on the graphics card. Since then, the third monitor seems to insist on having mini-display input?

What cable do I need to get to run the third monitor off a 1080Ti with the Index?

 

[kration]

To answer my own question after some fiddling around, and just in case anybody else has the same problem (and as a placeholder).

Each individual Dell U2414H monitor needs to be set up for the specific input from the graphics card.

Touch the left dot next to the power on button with the power light.

Then press the horizontal line 'menu' button.

Press down to 'Input Source'

Then scroll down and select (in my case) 'HDMI (MHL) 2' or whatever the input is.

Simple when you know how.