What kind of cable looks like HDMI but has only one slanted edge?

What is HDMI Port? slot hdmi For example, a Blu-ray player has an HDMI output port that it uses to output video and audio to a TV On the other hand, an HDMI input port is slot rng No signal to either Monitor says no signal coming from your computer I have tried with no success: HDMI directly into Nvidia 980 HDMI slot

slot la granja No signal to either Monitor says no signal coming from your computer I have tried with no success: HDMI directly into Nvidia 980 HDMI slot