1)Execute the following commands as root user
eeprom console=ttya
svccfg -s console-login setprop ttymon/terminal_type = "vt102"
2) Uncomment the following lines from "/boot/grub/menu.lst"
serial --unit=0 --speed=9600
terminal serial
3) Comment the following
#splashimage /boot/grub/splash.xpm.gz
4)Modify the following line
kernel /boot/multiboot kernel/unix -s -B console=ttya