[CentOS] raid 1 question

Hi,

I have a server with 2 disks. Installed centos 5.9 with raid1. I
created /dev/md0 to hold "/"  and /dev/md1 for swap and nothing else.
Grub is installed on /dev/md0. After the successful installation, the
server does not boot. I don't see the boot loader . I see a blank
cursor blinking.

What have I done wrong?

Thanks
Paras.