As the title suggests, my monitor isn't working with an active DisplayPort to HDMI Adapter.

Graphics Card: GTX 1080 Ti; which has three DisplayPorts and one HDMI (Which is required to be used by my Oculus Rift)
Adapter: Cable Matters Active DisplayPort to HDMI adapter

HDMI Cable: I'm unsure what brand the cable is, but my other monitor uses a different one and works fine with the adapter. Both monitors are identical. 

Things to note: Upon plugging the HDMI into the adapter, the computer detects that a new display device has been plugged in, but the monitor just says "No HDMI Detected" or something like that.

Does anyone possibly know why this is happening, and if there's a way I can solve this problem? Without having to purchase anything preferably.