Panasonic UHD DP-UB420 gives me audio but no video

[WonkaBedknobs83]

I recently replaced the HDMI cable that connects my Denon AVR-S950H receiver to my Epson Pro Cinema 6050UB projector, but while so far everything works properly again, one thing doesn't, and it's this.

I had it hooked directly into the receiver, and while I can get sound, I get no picture. I'm guessing this is a player picture because I can get still picture from the setup I have for VHS, Betamax, and Laserdisc, and I can even hook my MacBook Air from which I am typing this into the same receiver and project its picture onto my screen and play its audio through the same speakers. But the UHD player, the newest component in this setup, is holding out on me.

What do I do?