Chosen Solution
my galaxy note 9 powered off and won’t start up. At first, the blue light for full charge was seen… but now it is not there, and the charging cord (any charging cord) is not recognized. I have done the 3 different start up steps, but nothing is happening. What do I do next?
@dammiller1962 try a new charging cord. If it is still not recognized you may have to consider replacing the USB port. While there replace the battery as well. Jus to make sure it is not giving you any issue. check the teardown to see what is involved Samsung Galaxy Note9 Teardown
