Hi, I've got an assembled LCD and digitizer screen for my One X from etradesupply, and I've got the exactly same issue that you had. That was my third screen, and I bought from ETS because my intention was sell my HOX.
First time I've connected the 3 cables and it has worked, and then after turn off and turn on, the screen appeared like "using wrong video driver", some erratic lines, I don't known how to explain it better.
Now screen is completely off, but phone turns on and capacitive buttons works, I can enter in recovery, fastboot even without see (I have another hox, so I can reproduce the steps)
My first, the original screen has gen flex cable (Sharp) I had problems with digitizer, my second I bought from eBay, green flex cable too, cracked on vacation. The third screen has yellow/green flex and I had the described problem, I think it is not 100% compatible. That is my guess.
I will send it back to ets, they will make some tests to verify what happened.
Enviado de meu HTC One usando o Tapatalk 2