The message "keyboard not present, using TTYA to input and output" ISN'T an error. It means there is not a keyboard connected. The system will boot up and you can access it from the network.
Normally server doesn't have a keyboard or graphic head connected.
You can connect a dumb terminal or lap top to the serial port.
Dumb terminal (VT100, etc.)
DB25 (VT100) Serial port DB-25
pin 2 pin 3
pin 3 pin 2
pin 7 pin 7
Laptop (use hyperterm 8 databits, 1 parity, 1 stop/start
Xon/Xoff)
DB9 Serial port DB-25
pin 2 pin 3
pin 3 pin 2
pin 5 pin 7