Edit your /boot/grub/grub.conf file.My default is Gentoo.
Code:
# Celeron 850 tinwhistle /boot/grub/grub.conf file
default=2
timeout=10
splashimage=(hd0,1)/grub/splash.xpm.gz
title Red Hat Linux 7.3
root (hd0,1)
kernel /vmlinuz-2.4.20-20.7 ro root=/dev/hda6 hdd=ide-scsi
initrd /initrd-2.4.20-20.7.img
title Mandrake 9.0
kernel (hd0,6)/boot/vmlinuz root=/dev/hda7 quiet devfs=mount hdd=ide-scsi
initrd (hd0,6)/boot/initrd.img
title Gentoo
root (hd0,1)
kernel (hd0,1)/boot/bzImage root=/dev/hda3 hdd=ide-scsi
title Windows2k
rootnoverify (hd2,1)
chainloader +1
title Windows 98 Suckey Edition
rootnoverify (hd0,0)
chainloader +1