Follow https://wiki.radxa.com/Rockpi4/dev/serial-console instructions,
connect your RockPI4B to your PC with a TTL 2USB cable.
then plug in the PD power cable(ZMI 65W),
The board does not boot up and LED is not on either.
Without the TTL 2USB plugged, everything works well.
QC power supply works well.
Apple A1718 PD power supply works well.
It’s probably the defect of ZMI 65W power supply.
Will do more test to confirm this.