After achieving the use of one HDMI for video and the other for audio with the Raspberry Pi 4B, I used it for a couple of days without any issues.
However, now when I turn on my Raspberry Pi and both HDMI cables are connected, I can't get video, or I have it for only 1 second when the color palette appears.
After that, I can't see the boot process, but I know that it boots correctly because I can manage Kodi from the Kore app to turn it off correctly.
I have to unplug the HDMI cable used for audio and turn on the Raspberry Pi to get video.
Even if the home theater is turned off, just with the HDMI plugged into the Raspberry Pi, I can't get video.
I initially thought that it was related to the power supply I was using (5V 3.1A), so I bought a better one (5V 4A), but the issue persists.
Is this a configuration issue or a hardware issue? How can I fix it?
Thanks in advance.