@abal
Hey!
If you capture the information output through the UART console port, then the system is trying to boot.
You need to test like this.
Default
100Mbit port is WAN
1000Mbit port is LAN
After starting the system, the LAN port has an IP address of 192.168.1.1
Therefore, if your local network already has a computer or router with this IP address, then there will be a conflict of IP addresses and you will be able to see nothing.
This is the most common mistake that occurs.
Therefore, I advise.
Burn the installation image to the SD card again and connect the Rock Pi E directly with an Ethernet cable to the computer via the 1000Mbit LAN port on the Rock-Pi-E.
Configure the computer to obtain an IP address using DHCP.
Apply power to the Rock-Pi-E and be patient and wait for the computer to receive an IP address via DHCP from the Rock-Pi-E.
The first start takes a long time so be patient
I advise you to disconnect the console cable from the Rock-Pi-E, as it does not have the correct speed for you, it can generate garbage in the direction of the Rok-Pi-E console port and prevent it from starting
If you fail, I will try to simulate your situation on my own.
Good luck