Samsung TV not showing image from computer over 50' HDMI cable

Description of problem

Trying to connect 6 Samsung UHDTVs to a computer at my internship. The computer has two nVidia Quadro P5000's with 4 DisplayPorts each, and I have an active HDMI/DP adapter for each TV. The TV's were mounted today, and we tried hooking one up with one of the 50' HDMI cables we ordered. The computer detected the screen and acted as if it was there, but there was no image on the TV.

Other relevant info

TV model: 75" Class JU6500 4K UHD Smart TV

Cable model: Dynex DX-HG507

Adapter model:Club3D Displayport 1.2 to HDMI 2.0 UHD (CAC-1070)

When this issue began

Today

Recurring issue

Yes

Cause/Steps to recreate the issue

Unplugging HDMI cable and plugging back in.

What I've tried so far to resolve the issue

Tried a second HDMI cable of the same brand, same issue.

Tried connecting to different HDMI ports on the TV and different display ports on the computer, same issue.

Tried straightening out cable, same issue.

Tried connecting with a shorter HDMI cable (30'), works as intended.

Submitted July 01, 2017 at 03:57AM by riffraff11235 http://ift.tt/2sqNMaC