dual booting centos5.5 and fedora

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http://unix.stackexchange.com – I already have centos5.5 on my system whose hard disk is ~500GB. I have tried to dual boot with fedora 16. while installing fedora 16 I have created a ~250GB and ~4GB partitions for "/" and swap. The installation has gone pretty smoothly until a error at the end said that installing bootloader has been unsuccessful. The grub at boot time only shows centos entries .Now when I boot into centos and run the lvm->lvscan .. it shows 4 partitions (2 swap spaces and two "/" partitions for centos and fedora 16). How can boot into fedora. (HowTos)