Thank you so much for replying. As you can tell from my Original Post, I'm dying over here!
So, yes. I reseated all cables. I even removed the Wireless Adapter and its related cables completely and tested everything out with the original Wired/Cabled connection to the PC (the HDMI/DP and Power cables). I even reinstalled Viveport and ran Device Setup and it correctly identified my DisplayPort and USB connections. But still, no display on the actual Headset. Again, SteamVR's VR View shows everything tracking and displaying normally.
Also, I've been using the original 21-Watt Battery that came with the Cosmos Adapter Kit. I also tested with the Official OG Vive Battery as well as a third party Anker PowerCore Speed 10000mAh Qualcomm Quick Charge 3.0 Power Bank.