hello Bernie,
it's been a while and you probably have done it by now. Maybe it will be useful to someone. Unable to read diagnostics because it does not start. If you look at the closer you will find that it is drawing approximately 200mA when you press the power button. This is a problem to be solved in a good repair shop. Probably the damage was due to a defective cable or charger. Similar damage may occur with excessive wear of the charging port (usb-c in this model).