Linux server not booting after rebuilding software RAID

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http://serverfault.com – I have a dedicated server at 1and1 with a software RAID. I believe it's running CentOS. The hardware team at 1and1 replaced the secondary hard drive (sdb) and then I followed these instructions to rebuild the array: http://faq.1and1.com/dedicated_servers/root_server/linux_recovery/10.html At step 9 I was not able to view mdadm.conf as it was a generic file without my configuration. I still continued on as I knew the array was built exactly as the instructions have laid out anyway. I think this is a GRUB problem? Maybe I need to reconfigure mdadm.conf? I have no idea how to fix it. 1and1 all (HowTos)