The GPU is a 980 GTX Ti and has an HDMI port, two DVI ports, and 3 DisplayPorts. The HDMI cable is this one (https://www.amazon.com/219312-Cable-Category-1080P-Capable/dp/B01BY04QK4?th=1). It's 50ft long. Why is it that the cable works fine when going from my PC to the TV but going from my PC...