Serial device does not work
1.  Make sure that: 
•  The device is compatible with the server. 
•  The serial port is enabled and is assigned a unique address.
•  The device is connected to the correct connector.
2.  Reseat the following components: 
a.  Failing serial device.
b.  Serial cable.
3.  Replace the following components: 
a.  Failing serial device.
b.  Serial cable.
4.  (Trained technician only) Replace the system board.
Chapter 5. Problem determination 405