If you have only the PiScreen connected and no other hardware…does it work using the normal USB power? It doesn’t. The problem persists.
And when it “doesn’t boot” does the red Pi power light come on? is there anything on the TFT of PiScreen? Yes, the red light come on, but the green doesn’t. The TFT still always off.
One of those images shows the PiScreen working.. how did you get it working? Actually we’ve 3 devices working, but if I reboot it does not come back. If it is off, when I power on, it hardly work at the first attempt. I have to keep plugging and unpluggin the power connector many times, of course waiting for some seconds betweens these attempts to see if it is ok. Normally I try about 7 or 10 times until it boot normally.