boot using ur linux cd start installation and choose upgrade do not choose any additional packages when it asks u whether u want to upgrade ur boot loader configuration choose yes install grub on the partition u have mounted as /boot u did not mention whether ur /boot partition was beyond 1024 cylinder limit or not i assume it is so in that case use xosl http://www.xosl.org the entire process would take not more than 15 minutes and u wont have to reinstall linux
the linux rescue cd mounts your root filesystem (/) on /mnt/sysimage u would find ur /boot as /mnt/sysimage/boot
===== ninad purohit have a nice day :-)
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