Grub problem with RHEL 3 AS on a Sun v20z: reboot required manual intervention?

[Tony Tran]

I need help with RHEL 3 Update 4 AS on a Sun V20Z.
After installing RHEL3 and built the new kernel with
huge memory option; I rebooted the server. It went
thru the BIOS, and came up with the following message:
.....
GRUB loading Stage 2
Press any key to continue ...
If I don't hit any key, it will stay there for ever
If I hit a key, it will provide me with a choice of
3 different kernel, and automatically picks the first
kernel (which is OK) and reboot.
My question is:
How do I change the grub.conf file so that when I
reboot the server, it won't require any manual
intervention, such as: Press any key to continue?
Thanks in advance,
Tony
------------------------------------------------- 
#uname -a
Linux mtvv20z-03 2.4.21-27.ELhugemem #1 SMP Wed Dec 1
21:50:02 EST 2004 i686 ath
lon i386 GNU/Linux
Here is a copy my grub.conf file:
----------------------------------------------------
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making
changes to this file
# NOTICE:  You have a /boot partition.  This means
that
#          all kernel and initrd paths are relative to
/boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/sda2
#          initrd /initrd-version.img
#boot=/dev/sda
serial --unit-0 --speed=9600
terminal serial console
default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Enterprise Linux AS
(2.4.21-27.ELhugemem)
        root (hd0,0)
        kernel /vmlinuz-2.4.21-27.ELhugemem ro
root=LABEL=/ console=ttyS0,9600 console=tty0
        initrd /initrd-2.4.21-27.ELhugemem.img
title Red Hat Enterprise Linux AS (2.4.21-27.ELsmp)
        root (hd0,0)
        kernel /vmlinuz-2.4.21-27.ELsmp ro
root=LABEL=/ console=ttyS0,9600 console=tty0
        initrd /initrd-2.4.21-27.ELsmp.img
title Red Hat Enterprise Linux AS-up (2.4.21-27.EL)
        root (hd0,0)
        kernel /vmlinuz-2.4.21-27.EL ro root=LABEL=/
console=ttyS0,9600 console=tty0
        initrd /initrd-2.4.21-27.EL.img