OPPO repair

Have you done a full reset? I have had a few pieces, different makers, well known brands, when a reset solved things. Or, a partial fix, like 1 of the HDMI's comes alive.

best of luck.

computer shops work with hdmi outputs all the time, it's the brains, not the physics.

congrats!!!!

sometimes there are button combinations for reset that work if you cannot see the screen, time to find that out now. 

the manual usually tells you how, i.e. push power and ____ together for 5 secs. I have had to reset my Sony AVR a few times using button combos.